What was found
APU FAILED TO START AFTER LANDING FAULT LIGHT ILLUMINATED FOR 4 MINUTES AND THEN WENT OUT. RAN QRH AND DID NOT TRY A RESTART. GROUNDED - YES. INITIAL EVAL OF APU CONFIRMED NO START. ACCOMPLISHED B737-800 FIM 49-32-TASK 805. ALL RING OUTS GOOD. DURING GVI OF APU HARNESS, FOUND P-22 AT FUEL CONTROL LOOSE, RESEATED CONN. P-22. CHECKED AND SECURED ALL CONNECTORS ON APU. GVI OF HARNESS SHOWED NO DISCREPANCIES. REPAIR CONFIRMATION START ATTEMPT GOOD. STARTED APU 4 MORE TIMES WITH NO DISCREPANCIES. SYS OPS NML. REF B737-800 FIM 49-32 TASK 805, WDM 49-62-11.