What was found
AFTER CONFIRMING A BLEED AIR SEAL COUPLING LEAK ON SDR BIGA20160114-001, THE ACFT FIRE DETECTION SYS WAS GND TESTED NORMAL. A TEST FLIGHT WAS REQUESTED, DURING THE FLIGHT THE LT FIRE DETECTION FLICKERED. AGAIN THE SYS WAS TESTED ON THE GND & COULD NOT BE DUPLICATED, THE ENG FIRE LOOPS WERE SWAPPED FROM THE LT ENG TO THE RT ENG & ALL CONNECTIONS WERE INSPECTED, CLEANED & REASSEMBLED. GND CHECKS WERE NORMAL, TWO TEST FLIGHT WERE PERFORMED & THE PROBLEM COULD NOT BE DUPLICATED. THE SUSPECTED HARNESS MAY HAVE HAD A CONNECTION PROBLEM THAT WAS NOT IDENTIFIED, THAT WAS CORRECTED DURING THE FIRE LOOP REMOVAL & INSTALLATION.