As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) FOLLOWING APU WARNING HORN RCCB TRIPPED OFF FOUND 5 WIRES WHEE THE INSOLATION WAS BROKEN AND RELATED TERMINAL BUS CHEMICALLY DESTROYED BY SKYDROLL. APU FIRE-EX BOTTLE SQUIB WAS INTERMITTENT DUE TO DAMAGE. REPLACED TB AND REPAIRED WIRING AND AREA CLEAN FROM SKYDROL AND INSPECTED FOR LEAKS. NO LEAKS WERE NOTED, AIRCRAFT RETURNED TO SERVICE.