What was found
DURING INTERROGATION OF THE CDU. FOUND FAULT MESSAGE 49-41011, NO FLAME SHUTDOWN. ACFT GROUNDED. R & R THE IGNITION UNIT & IGNITOR PLUG IAW AMM 49-41-31, & 49-41-51. APU SHOWED A FAULT LIGHT DURING START. APU BITE CHECKED IAW FIM 49-61, TASK 801. SHOWED CURRENT STATUS FAULT 49-31160, FCU RESOLVER CIRCUIT SHOWS OPEN AND SAME FAULT HAD BEEN LOGGED IN MAINTENANCE HISTORY FAULT MEMORY FOR EACH OF THE LAST 18 STARTS. ACCOMPLISHED FIM 49-32, TASK 802. ACCOMPLISHED RESISTANCE TESTS AT APU FCU CONNECTOR P22, PINS 2 & 3 AND AT APU FIREWALL CONNECTOR D10436, PINS 12 & 26. RESISTANCE IN BOTH CASES WAS 72 OHMS, WITHIN LIMITS. CLEANED & REINSTALLED THE CONNECTORS & OPERATED APU, NO FAULTS.