As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) COMPRESSOR STALL ON START UP. PLASTIC WAS FOUND PROTRUDING FROM START BLEED VALVE. AFTER REMOVING BLEED VALVE, A 1.25 X 2 X .056 INCH PIECE OF PLASTIC WAS REMOVED, WHICH WHICH APPARENTLY HAD BROKEN FREE FROM THE BLEED AIR CHAMBER THAT SURROUNDS THE COMPRESSOR CASE ASSY.