What was found
POWERPLANT MESSAGE ON ED ON T/O NOTICED AT 5500 FEET, RETURNED TO FIELD. REMOVED FROM SERVICE. INTERROGATED CDS FOUND FAULT 230B AND 238AB TIME STAMP 02 DEC 2020, 07:07:21, REF FIM 61-20-05-810-829. INSPECTED AND CLEANED OVERSPEED GOVERNOR NR 1 ENGINE ELECTRICAL CONNECTION, REF Q400 WM 20-32-00. PERFORMED OPERATIONAL TEST OVERSPEED GOVERNOR, IAW Q400 AMM 61-20-00-710-803. FAULTS CLEARED, POWERPLANT MESSAGE CLEARED. OSG TEST PASSED. HEAT SHRINK APPLIED TO CONNECTOR BEFORE ENGINE RUN. NO HISTORY OF FAULTS. A/C RETURNED TO SERVICE. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.