As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BULK CARGO HEAT INDICATION. EMERGENCY DECLARED. FLIGHT RETURNED TO DEPARTURE. LANDING UNEVENTUL. ACCOMPLISHED AN AFT AND BULK CARGO HEAT TEST IAW FIM DMC-B787-A-21-40-F0-01A-421A-A. NO FAULTS FOUND. OPS CHECKED GOOD. AIRCRAFT WAS GROUNDED.