As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT ENG CONSTANT SPEED DRIVE UNIT OUTLET TEMP INDICATED HIGH ABOVE RED LINE. CSD DISCONNECTED DUE TO OVER TEMP. ACFT DIVERTED WITH OVERWEIGHT LANDING. REPLACED ENG OIL COOLER WITH GOOD OPERATIONAL CHECKS IAW AMM 24-40-01 & AMM 24-10-03.