As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INSPECTION TYPE: C, LT BODY L/G W/W STA 1480 BULKHEAD APU BLEED AIR DUCT CUT OUT FOUND CRACKED AT LEFT O/B SIDE LBL 100. CRACK LENGTH 2.5 INCH, LT BODY L/G W/W BS 1480 BULKHEAD APU BLEED AIR DUCT CUTOUT REPAIRED AS PER SB B747-53-2309 R1, EO B747-5310-3100-C AND DWG 144U2602.