As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ACFT IN PHASED INSPECTION. WHEN INSPECTORS REMOVED THE AVIONICS RACK TO TORQUE A LOOSE ATTACH FITTING BOLT ON THE RIGHT MLG UPLOCK FITTING, A CHECK WAS MADE OF THE OTHER ATTACH BOLTS. THE BOTTOM FORWARD ATTACH BOLT HEADS WERE FOUND SHEARED OFF. THE BOLT HEADS WERE FOUND ON TOP OF THE GEAR UPLOCK ASSY. THERE WAS EVIDENCE THE BOLTS HAD BEEN SHEARED FOR A LONG TIME. FURTHER EXAMINATION DISCOVERED THE BOLTS WERE PART NUMBER NAS1204-9 AND NOT THE REQUIRED NAS1204-8.