As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RT EGINE ROLL BACK ON CLIMB OUT. EMERGENCY DECLARED BY CREW, AIRCRAFT RETURNED TO DEPARTURE AIRPORT (135 MED FLIGHT) PATIENT ALREADY DROPPED OFF, ONLY 2 FLIGHT NURSES AND 2 CREW ON BOARD. ONSITE INVESTIGATION BY HOME BASE MX TEAM FOLLOWING DAY REVEALED EXCESSIVE DEBRIS ON GEARBOX ASSY LOWER CASE CHIP DETECTOR. ENGINE MANUFACTURED HAS ADVISED TO REMOVE ENGINE AND GEARBOX ASSEMBLY IN CASE OF FURTHER CONTAMINATION THE GEARBOX ITSELF.