As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU DOOR INTERCOSTAL AT FS 654 TO FS 672.20 IS CRACKED AIRCRAFT REMOVED FROM SERVICE REPAIRED DOOR INTERCOSTAL AT FS654 TO FS 672.20 REF AIR WISCONSIN SUPPLEMENTAL NO. 13-0851B AND BOMBARDIER PL601R-53-62-225 AT STRINGER 4L. CUT OUT DAMAGED AREA, HFEC NO DEFECTS NOTED, FABRICATED AND INSTALLED REPAIR DOUBLER REF BOMBARDIER PL601R-53-62-225.