As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FIREWALL PANEL 351BZ, PN 170-50263-401, UPPER FLANGE IS CRACKED 0.310" & LOWER FLANGE IS CRACKED 0.260". BOTH CRACKS ROUTED OUT AND NDT PERFORMED VERIFYING NO MORE CRACKING EXISTS ON WO 543242-320 IAW ETD 2012-170-012137 AND EA E175-53-300 REV IR WO 616039.