As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FRIDAY, DECEMBER 3RD 2021, DIVERTED TO KIWA DUE TO A FIRE BOTTLE LOW APU CAS MESSAGE. THERE WERE NO PASSENGERS ONBOARD. THE AIRCRAFT LANDED SAFELY AT KIWA. THE FLIGHT CREW MADE THE FOLLOWING ENTRY ON AIRCRAFT MAINTENANCE LOG (AML) FORM SERIAL NUMBER M219982: "FIRE BOTTLE LOW APU" CAS DURING FLIGHT ASSOCIATED WITH APU FAIL LIGHT." THE AIRCRAFT IS CURRENTLY IN WORK WITH TEXTRON AVIATION AT KIWA.