What was found
CLIMBING THRU 12,000 FEET OUT OF BFM EICAS L EMER DOOR LIGHT. LEVELED AT 15,000 AND RAN QRH. DECLARED EMERGENCY AND DESCENDED TO 10,000 FEET. PRESSURIZATION OPERATED NORMAL AND AFTER A FEW MINUTES AT 10,000 AND EICAS MESSAGE DISAPPEARED. GAINED ACESS TO #3 EMERGENCY EXIT DOOR SENSOR AND CK'D TARGET ON SWITCH IS WITHIN LIMITS REF.M.M. 52-71-00-5 CK'D SEAL STOPS AND SEALS WERE MATING WELL ALSO CK'D PRESSURIZATION AND FOR LEAKS ALL CK GOOD AT THIS TIME REF. M.M.52-21-01-2 AND 21-31-00-5-0 OK TO CONTINUE AT THIS TIME .