What was found
FWD CARGO DOOR CAUTION ON CLIMB OUT. RAN QRH. DECLARED EMERGENCY. RELEASED FOR SERVICE PER MEL : 52-71-01-01-B CATEGORY C. INSPECTED FWD LOWER CARGO DOOR. IT WAS CLOSED, LOCKED, VENT DOORS CLOSED AND VERIFIED CLOSED IN THE VIEWING WINDOWS. DEBRIEFED CREW STATED FWD LOWER CARGO DOOR LIGHT FLIKERING ON CLIMBOUT. WHEN DESCENDED THE LIGHT WENT OUT AND REMAINED OUT FOR THE REMAINDER OF FLIGHT. CYCLED FWD LWR CARGO DOOR. INSPECTED LATCHES AND PROX SWITCHES VISUALLY. NO DISCREPS NOTED. CLOSED DOOR, CHECKED FWD CARGO DOOR PROX SENSORS WITH BREAKOUT BOX, ALL SENSORS CHECK GOOD WITH DOOR CLOSED. ALL SENSORS ALSO CHECKED GOOD WITH DOOR OPEN IAW AMM 31-70-05-5-99. A/C OK FOR SERVICE.