As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON COMPLETION OF RT ENGINE START APU FIRE MASTER WARNING EICAS AND FIRE BELL CAME ON. QRH CHECKLIST RUN;BOTTLE FIRED. FOUND FUSE HOLDER FOR RELAY 205W LOOSE. RESECURED FUSE HOLDER AND PERFORMED G200 261010 APU FIRE DETECTION SYSTEM OPS TEST WITH NO DEFECTS NOTED.