What was found
AT FL 300, FWD EQPT VALVE EICAS MESSAGE DISPLAYED. CREW COMPLIED WITH ATI QRH CHECKLIST, AND LIGHT REMAINED ANNUNCIATED. AFTER SEVERAL MINUTES CREW NOTED A LOSS PRESSURIZATION AND EQUIPMENT COOLING CB POPPED OVRD DURING DESCENT. DIVERSION TO KILN WITH A DECLARED EMERGENCY. LANDING WAS UNEVENTFUL WITH NO ADDITIONAL PRECAUTIONARY ACTIONS. ON ARRIVAL AIRCRAFT GROUNDED FOR UNSCHEDULED MAINTENANCE. WORK IN PROGRESS