What was found
ON DEPARTURE FROM SFO AT APPROX 1500 FT FORWARD CARGO DOOR EICAS MESSAGE ILLUMINATED. WENT OFF AFTER APPROX FIVE MINUTES. DID NOT CHECK CARGO LIGHTS. *S/D* REPEAT NUISANCE MESSAGE WAS CORRECTED BY VERIFYING ADJUSTMENT OF FORWARD CARGO DOOR LOCK SENSOR, CLOSE SWITCH AND INDICATION LIGHT PER MM 52-71-02, WHICH WERE FOUND WITHIN LIMITS DESCRIBED. PROBLEM WAS ISOLATED TO NR 3 LOGIC CARD WHICH WAS REPLACED AND SUBSEQUENT OPERATIONAL CHECK SATISFACTORY WITH ALL OPERTIONS NORMAL.