What was found
SEA/BLI - FLT 7892 - ON TAKEOFF ROLL, CREW NOTICED A RED MASTER WARNING FLASHER AND FUEL PRESSURE LOW ANNUNCIATOR HAD ILLUMINATED. CAPTAIN CALLED ABORT. WHILE TAXIING BACK TO TERMINAL, CAPT NOTICED LT ENG SPOOLING DOWN ON ITS OWN AND COULD NO LONGER HEAR THE RADIO OR TRANSMIT ON THE FREQUENCY OR COMMUNICATE ON INTERCOM TO F/O. CAPT PULLED LT FIREWALL FUEL VALVE TO THE CLOSED POSITION, FEATHERED ENG, AND F/O SECURED ENG. CREW PERFORMED A SINGLE-ENG TAXI TO THE GATE WITH NO INCIDENTS. MAINT FOUND THE FIREWALL VALVE CLOSED UNCOMMANDED. REMOVED AND REPLACED T-HANDLE , PERFORMED OPER TEST OF T-HANDLE SYS, NO DISCREPANCIES. HIGH POWER RUN, NO DISCREPANCIES, ACFT RETURNED TO SERVICE. (X)