As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PRECAUTIONARY ENGINE SHUTDOWN DUE TO HIGH OIL TEMPERATURE. AIR RETURN TO CLT FOR RT ENGINE OIL HIGH TEMPERATURE. REMOVED AND REPLACED DCU 1, IAW CRJ 900 AMM 31-41-04-000/400-801. OPERATIONS CHECKED GOOD. PERFORMED OPERATIONS CHECK OF DCU 1, IAW CRJ 900 AMM 31-41-04-000/400-801, OPERATIONS CHECKS GOOD. RAN ENGINE AT IDLE FOR 30 MINS WITH OIL TEMP STABLE AT 77 DEGREES AT 24 MINS TO 30 MINS. NO FAULTS OR DEFECTS NOTED AT THIS TIME. OIL TEMP WITHIN LIMITS, PER CRJ 900 AMM 71-00-00-866-801-A02.