Hello all,I have one cylinder with compression in the low 60's on a 3300A with 300 hours. When checking compression I can hear air escaping when I remove the dipstick. This tells me air is flowing past the rings.This is cylinder #2 which always runs cool (never over 300 degrees F). One thought is that the the rings are gummed up with lead (I have always burned 100LL). Hopefully it is not a broken…