What was found
ATTEMPTED TO START APU AT FL360 FOR A CSS ON RELEASE- FAULT LIGHT ILLUMINATED WITH APU AUTOMATIC SHUTDOWN. WE RAN QRH PROCEDURE AND FAULT LIGHT WENT OUT AFTER ABOUT 1 MINUTE. DESCENDED TO FL 300 AND STARTED APU WITH NO PROBLEMS. SECOND START WAS APPROXIMATELY 8 MINUTES AFTER FIRST ATTEMPT. ACFT GROUNDED. ACCOMPLISHED FIM TASK 49-40 TASK 801 & 49-60 TASK 801 FOR FAULT 49-41010, NO ACCELERATION SHUTDOWN. ABLE TO SUCCESSFULLY START APU, AND VERIFIED FAULT DID NOT RECUR. TSR ISSUED. ACCOMPLISHED TSR AS WRITTEN FUEL FLOW CK WAS GOOD APPROX 7 GALLONS IN 2 MIN S/O GOOD REF MM 49-31-00-700-802 ALSO SIMULATED A COLD SOAKED APU S/O VALVE WITH SPRAY FREEZE FOR THE SAME TEST, TEST STILL GOOD. R & R INLET TEMP SENSOR REF MM 49-61-31, R & R P2 SENSOR REF MM 49-52-31.