As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FIREWALL PANEL 351BZ, UPPER FLANGE IS CRACKED 0.320" & LOWER FLANGE IS CRACKED 0.400". BOTH CRACKS ROUTED OUT AND NDT PERFORMED VERIFYING NO MORE CRACKING EXISTS ON WO 538068-129 IAW ETD 2012-170-011528 AND EA E175-53-292 REV IR WO 609551.