Audi a6 avant estate 2004 number plate light not working and water in the tail gate sorted

2004 audi a6 avant estate number plate light out now sorted the fault was 1 corrosion in the plug in the not use n/s rear fog light plug, 2 corrosion in the wiring loom connector bock by the n/s rear lights inside the boot,3 corrosion on the comfort unit multi plugs under the n/s front foot well ie under the carpet, unplug all the plugs and wd them. and last of all there a 5 amp mini fuse to check in mine it was fuse nm 4 did all that and now woks great ps all so fixed the water getting into the tail gate water was getting in by a seem that rungs a round the number plate look very hard and you will see small gaps in the plastic seems a bit of silly c*nt has sorted that out so I hope this helps some over poor sod how having the same problem as me ps its taken 4-5 hours to fix but there again I did not know where everything was that's what took the time finding all the locations