As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FLIGHT CREW REPORTED THE THE "PLT WARN" CIRCUIT BREAKER POPPED DURING FLGHT. THE CIRCUIT BREAKER DID NOT RESET AFTER 1 ATTEMPT. TROUBLESHOOTING ISOLATED THE PROBLEM DOWN TO THE A172 PCB, PN 128-364086-1. THE PCB WAS REPLACED WITH A REPAIRED UNIT IAW THE WDM 33-41-01. FUNCTIONAL CHECKS WERE SATISFACTORY.