As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PERFORMING AD 2012-26-02 (M), FOUND MFEC CRACK INDICATION ON CHEM MILL LINE STR10R, BS500B+4 TO BS500B+5 ONE INCH LONG. REPAIR IAW EA PD37-53-3157, BOEING REPAIR SKETCH NAC-NAC-20-0008-09C REF BOEING ID 202002140020-0004. IAW SB 737-53A1234 R2 FIG 34. AWAITING AMOC AT THIS TIME.