What was found
ETOPS SIGNIFICANT SYSTEM, APU IN-FLIGHT START, FL410, OAT -56 C, SAT UNSUCCESSFULLY STARTED ON 3 ATTEMPTS. POST FLIGHT REPOST AND BITE OF ECU SHOWED FLOW DIVIDER FAULT. INSPECTED FLOW DIVIDER AND FOUND LOWER LINE OF FLOW DIVIDER LOOSE. TIGHTENED LINE IAW AMM 49-31-51. OPS CHECK OF APU WITH NO FAULTS NOTED.