As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FIREWALL 351BZ, HAS TWO CRACKS IN THE RADIUS AT BOTH ENDS. UPPER CRACK IS 0.400" AND LWR CRACK IS 0.500" X=28868.0. BOTH CRACKS ROUTED OUT AND NDT PERFORMED VERIFYING NO MORE CRACKING EXISTS IAW ETD 2013-170-027936 AND EA E175-53-372, REV IR.