As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INSPECTION FINDING THAT AG CATS 'G164A' MANUFACTURED PRIOR TO FEBRUARY 15, 1967, HAVE NOT BEEN MODIFIED PER ENGINEERING CHANGE ORDER S164-1845. CHANGE PREVENTS CHANCE OF ACCIDENTAL LOCKING OF RT BRAKE MASTER CYLINDER DURING FLIGHT MANEUVERING.