As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FLT LEVEL 270, ENG FIRE WARNING BELL SOUNDED AND EXT 2 TIMES. FIRE WARNING MAIN CARGO SMOKE AND GROUND FAULT DET SYS CHECKED GOOD. CONNECTORS CHECKED AND CLEANED ON FIRE AND OVHT DET MODULE. ENG FIRE WARNING TEST PER MM 26-11-001-5. SYS CHECKED SERVICEABLE.