Every time I have taken an aircraft to a new engineer the following has happened;
Sharp intake of breath, followed by a long list of problems, which, of course, were everybody else’s fault but not theirs because they only just got it.
The problem is, some times they are right! The best bet is to get a reasonable engineer and stick to him like glue. Only way to find one is by several personal recommendations.
Failing that, get a PFA aircraft and do it yourself. If you want it done right you do it yourself has lots of meaning when it is your neck on the line, or at least in the left hand seat!
Rod