As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING ROUTING ACFT C-CHECK, THE THERMAL BLANKET ON THE REAR GAS GENERATOR CASE, GGC WAS FOUND RIPPED OPEN AND THE GGC WAS FOUND BURNED AND BREACHED. LOCALIZED HEAT DAMAGE SURROUNDED THE AREA HOWEVER NO OTHER APPARENT DAMAGES APPEAR TO BE PRESENT ON ENGINE OR NACELLE. THE APU WILL BE REMOVED AND FORWARDED FOR INVESTIGATION.