As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING GROUND RUN PRIOR TO FLIGHT, TRANSMISSION CHIP LIGHT ILLUMINATED. AIRCRAFT WAS SHUT DOWN. ON INSPECTION, MECHANIC FOUND A SLIVER ON FREE WHEELING UNIT CHIP PLUG. CLEANED CHIP PLUGS AND PERFORMED MAINTENANCE REQUIREMENTS STATED IN MM. AIRCRAFT APPROVE FOR RETURN TO SERVICE.