I had a Generator repair vendor issue a few years ago.  I was surprised to find out that there was a local vendor that was timely, knowledgeable and extremely effective.  They have been able to tackle big and small issues with ease.  They are also very communicative with everything they do.  They walk us through everything they work on so we understand.  Penncat Energy is that vendor and they have been a valuable partner for me since I brought them onboard.