Help with some D3 S8 error codes

[homer simpson]

Hi all, I went to see a lovely S8 today and I am very close to pulling the trigger. The seller (trade) was happy for me to do a scan and left me to it so i did after a test drive. The car drove beautifully and all the electrics work bar the button on the driver's door (lock) handle. Are these anything to worry about or any expensive to fix? The parking brake fault for the rear sensor I am hoping is a wear sensor as the car has ceramics!

Any help appreciated

1. 005491 - Left Engine Mount Solenoid Valve (N144)
P1573 - 004 - Open Circuit

2. 02596 - Rear Brake Pads Worn
008 - Implausible Signal

3. 006435 - Please Check DTC Memory of ECU Number 2
P1923 - 008 -

Gateway Installation List: 4L0 910 468 A
00-Steering Angle Sensor -- Status: OK 0000
01-Engine -- Status: Malfunction 0010
02-Auto Trans -- Status: OK 0000
03-ABS Brakes -- Status: OK 0000
05-Acc/Start Auth. -- Status: OK 0000
06-Seat Mem. Pass -- Status: OK 0000
07-Control Head -- Status: OK 0000
08-Auto HVAC -- Status: Malfunction 0010
09-Cent. Elect. -- Status: OK 0000
0E-Media Player 1 -- Status: OK 0000
0F-Digital Radio -- Status: OK 0000
11-Engine II -- Status: Malfunction 0010
31-Engine other -- Status: Malfunction 0010
13-Auto Dist. Reg -- Status: OK 0000
15-Airbags -- Status: OK 0000
16-Steering wheel -- Status: OK 0000
17-Instruments -- Status: OK 0000
19-CAN Gateway -- Status: OK 0000
1D-Driver Ident. -- Status: OK 0000
1E-Media Player 2 -- Status: OK 0000
28-HVAC, Rear -- Status: OK 0000
34-Level Control -- Status: OK 0000
36-Seat Mem. Drvr -- Status: OK 0000
37-Navigation -- Status: OK 0000
38-Roof Electronics -- Status: OK 0000
42-Door Elect, Driver -- Status: OK 0000
46-Central Conv. -- Status: OK 0000
47-Sound System -- Status: OK 0000
4F-Centr. Electr. II -- Status: OK 0000
52-Door Elect, Pass. -- Status: OK 0000
53-Parking Brake -- Status: Malfunction 0010
55-Headlight Range -- Status: OK 0000
56-Radio -- Status: OK 0000
57-TV Tuner -- Status: OK 0000
61-Battery Regul. -- Status: OK 0000
62-Door, Rear Left -- Status: OK 0000
65-Tire Pressure -- Status: OK 0000
67-Voice Control -- Status: OK 0000
6C-Back-up Cam. -- Status: OK 0000
72-Door, Rear Right -- Status: OK 0000
76-Park Assist -- Status: OK 0000
77-Telephone -- Status: OK 0000

Fault Codes have been Erased
1 Fault Found:
006435 - Please Check DTC Memory of ECU Number 2
P1923 - 008 -
Freeze Frame:
Fault Status: 01101000
Fault Priority: 0
Fault Frequency: 1
Reset counter: 255
Mileage: 148321 km
Time Indication: 0
Date: 2018.05.23
Time: 15:13:13
Freeze Frame:
RPM: 640 /min
Load: 22.3 %
Speed: 0.0 km/h
Temperature: 102.0°C
Temperature: 66.0°C
Absolute Pres.: 1010.0 mbar
Voltage: 12.954 V
Readiness: 0110 1101

Address 01: 1 Fault Found:
006435 - Please Check DTC Memory of ECU Number 2
P1923 - 008 -
Freeze Frame:
Fault Status: 01101000
Fault Priority: 0
Fault Frequency: 1
Reset counter: 255
Mileage: 148321 km
Time Indication: 0
Date: 2018.05.23
Time: 15:14:51
Freeze Frame:
RPM: 639 /min
Load: 20.4 %
Speed: 0.0 km/h
Temperature: 102.0°C
Temperature: 67.0°C
Absolute Pres.: 1010.0 mbar
Voltage: 13.208 V
Address 11: 1 Fault Found:
005491 - Left Engine Mount Solenoid Valve (N144)
P1573 - 004 - Open Circuit
Freeze Frame:
Fault Status: 01100100
Fault Priority: 0
Fault Frequency: 1
Reset counter: 255
Mileage: 148321 km
Time Indication: 0
Date: 2018.05.23
Time: 15:14:49

Fault Codes have been Erased
1 Fault Found:
02596 - Rear Brake Pads Worn
008 - Implausible Signal
Freeze Frame:
Fault Status: 01111000
Fault Priority: 6
Fault Frequency: 1
Reset counter: 9
Mileage: 133232 km
Time Indication: 0
Date: 2015.09.24
Time: 00:02:20
Freeze Frame:
Voltage: 10.46 V
Count: 61