As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LT BLEED AIR LEAK IN FLIGHT WOULD NOT EXTINGUISH WITH BLEED AIR TURNED OFF. MAINTENANCE ACCESSED BLEED LINES IN AREA OF FAULT DETECT AND PERFORMED GROUND RUNS. NO FAULT FOUND. SWAPPED A76 AND A77 LEAK DETECT BOXES AND PERFORMED OPERATIONAL CHECK FLIGHT. NO DISCREPANCIES REPORTED. AIRCRAFT APPROVED FOR RETURN TO SERVICE. WILL MONITOR THE SITUATION FOR REOCCURRENCE.