Newbie with 2003 a4 avant 3.0 Quattro needing help

[Ianv6]

Ok I'm new to Audi but believe this is a common fault
picked car up yesterday but so far found the following faults,

rear wiper doesn't work

front wipers just move slightly then stop you then have to use the switch and move by hand to get them back down

rear parking sensors going off but there does seem to be paint bubbles on sensor so thinking it could be that

Any suggestions on the above

thanks in advance

cheers
Ian