Low compression on 3 cylinders
 

Hello everyone!
I have a 2004 Audi A4 B6 Quattro 3.0L A/T with 109k miles that drew a misfire on cylinder #4.
I just had the timing belt and right after turning it on it drew a misfire code. The mechanic checked the compression on cylinders 4, 5, and 6.
4= 30
5 = 90
6= 90.
Mechanic will be checking it again this week to see what the issue may be. The spark plugs and coils were also replaced during this timing belt job. I appreciate any suggestions! Thanks!!