As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE BEING OVERHAULED, AN OCCURRENCE OF CRACKS WERE NOTED IN SEVERAL VALVE BODIES. THERE ARE NO NDT CHECKS FOR BODY P/N 1692E41 OTHER THAN X10 MAGNIFICATION VISUAL CHECK IN THE SARGENT OMM 32-50-04. SUBMITTER SUGGESTED THAT AS A MINIMUM, A DYE PENETRANT FLAW DETECTION IS CARRIED OUT ON THIS PART AT EVERY OVERHAUL.