As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ABOUT 10 MINUTES AFTER DEPARTURE, THE PILOT NOTICED A STEADY LT WING OVERHEAT ANNUNCIATOR. THE PILOT IMMEDIATELY RAN THE EMERGENCY CHECKLIST. PILOT DECLARED AN EMERGENCY & LANDED WITH NO FURTHER PROBLEM. MX TROUBLESHOOTING REVEALED LT BLEED AIR REGULATOR WAS DISCREPANT. MX R & R LT BLEED AIR REGULATOR VLV WITH PN 392908-1-1 IAW SA227 MM 21-10-20, PERFORMED ENG RUN UP, OPERATION & LEAK CHECKS BOTH WERE NORMAL.