That's why hiring diesel
mechanics will bankrupt you.
They didn't find anything you couldn't have found and fixed yourself. But you had to pay them close to $100 an hour, I bet, to go through many hours of spelunking and head
scratching to figure it out.
Grab a wrench, gird your loins, and dig in yourself the next time the engine
acts up. As frustrating as it sometimes is, you can generally diagnose and fix any problems yourself if you keep plugging away. That's basically what the pros do.
It also helps me a lot to ask buddies around the marina or to post questions on this discussion forum if I'm just befuddled. That will usually help break up the case of brainlock that is keeping me from diagnosing the problem.
Enjoy your trip! If the engine
poops out, throw out an anchor
and dig in! It's part of the fun! And don't be frustrated by the problems and the mechanic's bill. Been there. Done that. I bet most of us have.