Not an A&P, but I do work in avionics and have for a considerable spell. Where there's a persistent issue like this one, the thing not to do is shrug and tell the flight crew to ignore the warnings. It's caused by something, and whatever it is should be resolved. Peoples' lives are at stake.
I wouldn't let that mechanic touch my airplane.
edit: if your AHRS systems are 142185-3101s and if they ever give you problems, or you just have questions, PM me.
Last edited by RiverRider; 05/01/22.
