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 0.360" & LOWER FLANGE IS CRACKED 0.280". BOTH CRACKS ROUTED OUT AND NDT PERFORMED VERIFYING NO MORE CRACKING EXISTS ON WO 551823-322 IAW ETD 2012-170-012686 AND EA E175-53-302, REV IR WO 622384.