What was found
APU FAULT LIGHT ILLUMINATED ON 2 ATTEMPTED CSS STARTS AT FL 370. APU STARTED ON 3RD ATTEMPT AT FL300. ACFT GROUNDED. APU BITE SHOWED TWO FAILED START ATTEMPTS WITH OVERTEMP SHUTDOWN MAINT MSGS 49-31016 LOGGED. PERFORMED TWO STARTS FOR GROUND VERIFICATION, BOTH WITH A MAX TEMP OF 820 DEGREES. COMPLIED WITH FIM 49-30-00-810-803, DETERMINED FAULT WAS INTERMITTENT FAULT. COMPLIED WITH APU START & OPS TEST IAW AMM 49-11-00, OPS CHECKED GOOD. REMOVED AND REPLACED T2 SENSOR AND CLEANED INLET PRESSURE SENSOR. REF MM 49-61-31 AND 49-52-31 AND FAULT CLEARED. OPS CHECKED NORMAL.