As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SECOND FROM BOTTOM OUTBOARD ROW OF FASTENER HOLES FOR LT HAND MAIN LANDING GEAR FORWARD TRUNNION SUPPORT FITTING HAS TOOLING MARK INSIDE FUEL TANK. INSTALLED FREEZE PLUG IAW SRM 51-20-10, SRM 51-10-02, SRM 51-20-10 & EA B737-57-030325.