As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FIREWALL PANEL 351BZ P/N 170-50263-401 UPPER FLANGE IS CRACKED 0.280" & LOWER FLANGE IS CRACKED 0.300". BOTH CRACKS ROUTED OUT AND NDT PERFORMED VERIFYING NO MORE CRACKING EXISTS ON WO 555052-318 IAW ETD 2012-170-013347 AND EA E175-53-306 REV IR WO 628041.