As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR TURNBACK: FLIGHT 8216: ON CLIMB RECEIVED A MASTER CAUTION AND "ENG" LIGHT ILLUMINATED ON THE CAP. PILOT ELECTED TO RETURN. AIRCRAFT LANDED AT AIRPORT VFR WITHOUT INCIDENT. MAINTENANCE RE-INDEXED PROP TRANSFER TUBE TO PCU, REPLACED SEALS ON TRANSFER TUBE. AIRCRAFT RETURNED TO SERVICE.