As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TRANSMISSION CHIP DETECTOR LIGHT ILLUMINATED IN-FLIGHT, ELECTED TO LAND AT A SITE OTHER THAN THE DESTINATION. FOLLOWING THE AMM AND ANALYSIS OF THE CHIPS ON THE CHIP DETECTOR AND THE TRANSMISSION FILTER, ACFT WAS FLOWN FOR FLUSHING OF THE TRANSMISSION AND RETURNING THE ACFT TO SERVICE.