What was found
(CAN) AFTER PERFORMED MAINTENANCE BY (CSF) AND INITIATED A GROUND RUN FOR A LEAK CHECK. START TEMPERATURES WERE NORMAL AT IDLE AND WHEN THE PILOT SWITCHED TO FLY MODE MGT AND OIL TEMPERATURE ROSE TO A POINT THAT THE OIL TEMPERATURE CEASED TO REGISTER ON THE G1000. AFTER REVIEW OF 1HZ LOG FILE: AFTER REVIEW, WE DO SEE ENG OIL TEMP CONSTANTLY GOING UP REACHING 132DEGC THEN BECOMING INVALID (NAN). WE ALSO NOTICE ERRATIC MGT BEHAVIOR (TC# 20190911013)