As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
REMOVAL OF THE APU IS REQUIRED FOR COMPLETION OF SB THAT REPLACES THE APU FIREWALL. UPON DISASSEMBLY OF THE APU FROM THE APU SUPPORT TRUSS, FOUND SHOCK MOUNT DELAMINATING. INSPECTING OF THIS AREA WAS DETERIORATE UNTIL THE NEXT INSP INTERVAL FOR THIS PART. THIS IS THE 4TH TIME WE HAVE SEEN THIS ISSUE IN THE PAST 2 WEEKS ON 4 WEEKS ON 4 DIFFERENT SERIES ACFT.