As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOTS REPORT "REAR BAY OVERHEAT" ANNUNCIATOR ILLUMINATED DURING CRUISE FLIGHT. DESCENT WAS REQUESTED BUT NOT AUTHORIZED BY ATC, SO AN EMERGENCY WAS DECLARED IN ORDER TO DESCEND. WARNING LIGHT EXTINGUISHED A SHORT TIME AFTER DESCENT WAS COMPLETED. INSPECTION OF THE VALVE REVEALED A SEVERE WARP AT THE FLANGE CONNECTING THE LP AND HP DUCTS FROM THE ENGINE. SEVERAL STUDS WERE SHEARED AT FLANGE.