As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FWD AFT RED CARGO FIRE EICAS ILLUMINATED FOR APPROX 5 SECONDS PASSING FL250. WITH AUDIBLE. ON TURNBACK, LIGHTS WENT OUT WITH NO MORE WARNINGS. NO BOTTLES EXPENDED DUE TO SHORT DURATION OF LIGHT. R & R THE FIRE DETECTION PRINTED CIRCUIT CARD M10427 IAW MM 26-10-01-4, OPS CHECKED NORMAL.