What was found
AIR TURN BACK, EMERGENCY DECLARED, PASSING FL200 ON DEPARTURE LT ENG OIL TEMP CLIMBED INTO AMBER RANGE (HIGH AS 164) RUN QRH AND OIL TEMP SLOWLY RETURNED TO SAME AS RT ENG. RESULTED IN ATB T/S IAW FIM 79-34 FAULT TREE 808. PER FIM, R/R OIL TEMP SENSOR IAW AMM 79-34-01. OPS CHECK GOOD, NO LEAKS NOTED.