What was found
APU FAULT ON TAXI IN. APU WOULD NOT START. GROUNDED - YES. FOUND FAULT 49130100 WITH ASSOCIATED MAINT MSG 49-41012 AND WAS NOT ACTIVE. STARTED B737-9 IFIM 49-40-00-810-805 INITIAL EVAL AND NO ACTIVE FAULT. HOWEVER WHEN STARTING THE APU FAULT LT APPEARED WITH FAULT 49-41254 (SCU SHOWS START SYS INOP) AND IT STAYED ACTIVE, RELEASED PER MEL 49-11-01. REF IFIM 49-40-00-810-821 NO ACTIVE FAULTS DETECTED AT THIS TIME, APU WORKING AS INTENDED. CLEARS MEL.