What was found
DURING C/W SB 521, FOUND ENTIRE EXHAUST CROSSOVER PIPE DEFECTIVE EXCEPT PIPE P/N 40B19974. REPLACED ALL DEFECTIVE PIPES WITH NEW.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
DURING C/W SB 521, FOUND ENTIRE EXHAUST CROSSOVER PIPE DEFECTIVE EXCEPT PIPE P/N 40B19974. REPLACED ALL DEFECTIVE PIPES WITH NEW.