One of the minor issues I've had since getting the A8 is that it was continuously blowing the fuse for all the interior lights. I also noticed that when this happened, I didn't get the indicator flash when locking or unlocking the car. The alarm horn didn't work either.
After scouring the forum, there was a comment about the batteries in the alarm horn causing corrosion, so with Saturday being a good day and me being reasonably okay, I set about trying to locate the alarm horn, and this is what I found:
Two of the pins heavily corroded and part of the plastic missing:
Front and back views of the circuit board:
With this removed, I replaced the 10A fuse, and so far, everything is fine. If I'm up to it, a trip to the scrapyard tomorrow and hopefully I can pick up the alarm and maybe part of the loom.
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2001 A8 D2 FL 3.7 Q - LPG Conversion, Engine: AKC, Gearbox:FBB, Colour:LY5X Aqua Blue pearl effect, Interior:WJ light beige/dark beige valcona leather with burr walnut inserts
My DIY jobs -
Replaced alarm horn,
Replaced Coolant Temp sensor,
Updated RNS-D firmware,
Installed Reversing Camera and Digital TV,
Dashcam Installation,
Retrofitted Rear Blinds,
Auto-Dimming Rear View Mirror,
Chrome Boot Struts
Sold! 
2008 S8 D3 5.2 V10 - Engine: BSM, Gearbox:KLW, Colour:LY7F Suzuka Grey Pearl Effect, Interior:Black/Black with Silver/Black valcona leather with carbon atlas inserts, Bang & Olufsen, Heated windscreen, Soft-close doors, TV, DAB, AMI, Quad Zone, Auto Boot, Auto dim Mirrors, Keyless entry, PDC with rearview camera, AFS II Headlights
My DIY jobs -
Fan Jet Windscreen Washers,
Retrofitted Electric Side Blinds