As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A ROUTINE INSPECTION, A CRACK WAS FOUND IN THE UPPER END OF FRAME 9V IN THE RIGHT SIDE SHELL. THE CRACK WAS APPROXIMATELY 2.5 INCHES LONG. THE CRACK EXTENDED UNDER THE ATTACHMENT OF THE INBOARD WEB ATTACHED TO THE RIGHT AFT MAIN GEARBOX ATTACHMENT FITTING IN THE AIRFRAME. REPAIRED PER FIELD APPROVED 337 AND BOLKOW SB SI-BO105-142.