Placido, perhaps https://www.savvyaviation.com/savvyaviation-home/savvy-services/savvyqa/ is a good idea. From friends I talked to, and from my own experience during my first year of ownership, Savvy has a very systematic approach to troubleshooting, especially with engines. They are of not much value for TB20/21 airframe and avionics issues, though fantastic if you own a Cirrus, I was told....