Went with a friend yesterday in his boat. Noticed when he started it there was a "noise" that occurred with every revolution of the motor. I told him to go have his compressor inspected as I have read on here about those things failing. He bought the boat used and it's a 2009. I have no serial numbers. Sorry. I'm only asking if I was correct in warning him of this potential problem? It sounded really bad. Every revolution of the motor produced a squealing or wheezing sound