What was found
ON CLIMBOUT APU FAULT LIGHT & MASTER CAUTION ILLUMINATED FOLLOWED QRH CONTACTED MX CONTROL & DISPATCH AGREED AFTER 5 MIN RESTART APU IF FAULT LIGHT GOES OUT. AFTER FAULT LIGHT WENT OUT RESTARTED APU, APU STARTED NORMALLY & WAS AVAILABLE. FOUND MAINT MSG 49-52017 IN HISTORY ACCOMP FIM 49-50-00-810-801. AFTER RUNNING APU THRU 2 STARTS WITH NO OTHER OCCURRENCES DETERMINED THIS TO BE AN INTERMITTENT FAULT PER FIM 49 50 00 810 801. AS A PRECAUTION VERIFIED AIR INLET DUCT AND COMPRESSOR INLET PLENUM ARE FREE FROM ANY BLOCKAGE. REPLACED DELTA PRESSURE SENSOR PER MM 49 52 33. TESTS GOOD PER SAME.