As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 2 TGT FLUCUTATED BETWEEN 0 AND 600 DEGREES IN FLIGHT. AIRCRAFT RETURNED TO AIRPORT. NO EMERGENCY WAS DECLARED AND THE AIRCRAFT LANDED WITHOUT INCIDENT. FOUND BROKEN WIRE ON CONNECTOR PLUG BACKSHELL AT FIREWALL. ENTIRE HARNESS WAS REPLACED. AIRCRAFT WAS RETURNED TO SERVICE. (K)