As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT NR 3354, LT PROP OIL TEMP FLUCTUATES. AIR RETURN TO DTW. MAINTENANCE REPLACED LT ENGINE OIL TEMP PROBE IAW GE MM CHAP 79. REPLACED LT ENGINE OIL TEMP/PRESS INDICATOR IAW SAAB AMM CH 77. PERFORMED GROUND RUNS. ALL INDICATIONS NORMAL OIL QUANTITY CHECK GOOD. ENG OIL TEMP PROBE P/N 4053T73P01, S/N ON EGNAB451. ENG OIL INDICATOR P/N 522794, S/N ON 06871426.