Piper 19 how long are your turnarounds?
Valve, Controller, sense lines, icing. Could be anything or all of the above that's why we engineer our way to the solution.
You could also check the dodgy earth to the EICAS computer that brings it on in the decent as opposed to TOD. Lol
I was always taught look at the obvious and take what is written in the log as the failure and not a technical description!
