As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN TRANSMISSION HAD STAGE 2 HIGH IRON INDICATION FROM OIL SAMPLE, REQUIRING INPUT DRIVE STAGE TOOTHING INSPECTION IAW ASB EC135-63A-012 WITHIN 25 FH. INSPECTION REVEALED PITTING IN BOTH INPUT PINIONS & BEVEL GEAR OF MAIN TRANSMISSION REQUIRING REPLACEMENT OF TRANSMISSION. THIS ACFT IS CURRENTLY OUT OF SERVICE AWAITING THIS REPLACEMENT TRANSMISSION.