As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING HMV, CRACKS WERE FOUND IN THE APU AIR INTAKE PLENUM BELLMOUTH. THE CRACKING WAS ADDRESSED IN BOEING SERVICE BULLETIN 757-49-0011 AND THE CRACKED BELLMOUTH WAS REPLACED WITH A MODIFIED BELLMOUTH ASSEMBLY AS DIRECTED BY THE SERVICE BULLETIN.