Find content
Not Telling
$400 to tell you it needs a rebuild with no specifics seems like a crappy deal. I'd say find yourself a new mechanic or dealership. One tip, the season is already near its end so if you ARE going to have it rebuilt wait till the cold months come and they'll beg you for the work.
I personally would try to research more, and get a few more opinions. 130 vs 150 is quite a substantial drop so it definitely shows ring issues with that one cylinder. If all 3 were in the 130 range I'd say you are good to go, but with just one that low it sounds like there is/was an issue at some point.
Good luck.
