As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU COMPARTMENT STRUCTURE R/H WALL AFT LOWER FASTENER HOLE FOR THE APU AFT AIR INLET HAS CORROSION. GROUNDED - YES. REMOVED DAMAGE FOUND TO BE OUT LIMITS, REPLACED TEE IAW B737-800 SRM 51-40-02-0G-0& 51-40-05-0G-0W= 1" O= .061 L= 2" R= .031" D= .030".