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 0.450" & LOWER FLANGE IS CRACKED 0.350". BOTH CRACKS ROUTED OUT AND NDT PERFORMED VERIFYING NO MORE CRACKING EXISTS ON WO 562432-314 IAW ETD 2012-170-014778 AND EA E175-53-310 REV IR WO 642464.