A B737-300 ON APCH DECLARED AN EMER DUE TO NO LNDG GEAR POS INDICATION LIGHTS. FOUND 2 ANNUNCIATOR AND CTL CIRCUIT BREAKERS TRIPPED.

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WE PUSHED 1 HR LATE DUE TO ACFT BEING MISFUELED. DURING ENG #2 START; I NOTICED THAT THE START VALVE LIGHT DID NOT COME ON. I CALLED THIS OUT; BUT ALSO NOTICED WE HAD THE ENG STARTING WITH ALL OTHER INDICATIONS OK. I VERIFIED START CUTOUT BY THE STARTER SWITCH GOING BACK TO OFF AND AN AIR PRESSURE RISE. WE PUSHED IN THE START VALVE LIGHT BUTTON AND LIGHTS DID NOT COME ON. AT THIS POINT WE ASSUMED THAT THE BULBS WERE OUT. I SHOULD ALSO NOTE THAT ON THE BEFORE START CHKLIST THE CAPT SAID A BULB WAS OUT ON THE AUTOBRAKE LIGHT. I SHOULD HAVE THOUGHT AT THIS POINT THERE MUST BE A COMMON PROB; BUT DID NOT. WE TAXIED OUT FOR A NORMAL DEP AND FIGURED TO REPLACE THE START VALVE LIGHT BULBS INFLT. WE DID THIS ENRTE AND NOTICED THAT THEY DID NOT WORK AND WOULD CALL FOR MAINT. FLT WAS NORMAL UNTIL WE WERE ABOUT A 6 MI FINAL AND I CALLED FOR LNDG GEAR DOWN AND FINAL DSCNT CHKLIST. AT THAT TIME I NOTICED WE HAD NO LNDG GEAR INDICATIONS. WE ADVISED TWR THAT WE WOULD BE GOING AROUND DUE TO A GEAR PROB. WE LEFT THE GEAR DOWN AND CLBED TO 5000 FT AND WENT BACK TO DEP CTL. PUSHING IN THE GEAR INDICATOR LIGHTS SHOWED NOTHING. WE BOTH KNEW IT HAD TO BE ELECTRICAL BUT WENT INTO THE APPROPRIATE LNDG GEAR MALFUNCTION CHKLIST. BEFORE WE RAN THIS CHKLIST; THE CAPT GOT UP AND CHKED THAT ALL CIRCUIT BREAKERS WERE IN. I EVEN MOVED MY SEAT ALL THE WAY FORWARD SO THAT HE COULD GET A GOOD VIEW OF THE BREAKERS BEHIND MY SEAT. HE ALSO VISUALLY CHKED THAT THE NOSE GEAR WAS DOWN. WE HAD A COMPANY CAPT IN THE BACK AND ASKED THAT HE CHK THE MAIN GEAR. HE DID THIS AND INFORMED US THROUGH THE FLT ATTENDANTS THAT THEY BOTH WERE OK. THE CAPT WAS ALSO TRYING TO GET SOME INPUT THROUGH MAINT CTL WHILE I CONTINUED TO FLY AND WORK WITH ATC. AFTER ABOUT 20 MINS; THE CAPT INFORMED ATC THAT WE WOULD BE LNDG AND WAS DECLARING AN EMER. LNDG WAS NORMAL; BUT WHILE TURNING OFF THE RWY THE CAPT STATED THAT THE NOSEWHEEL STEERING WAS NOT WORKING. WE TOLD TWR THAT WE WOULD STOP ON THE HIGHSPD TXWY AND WOULD NEED TO BE TOWED INTO THE GATE. AFTER ARR AT THE GATE; MAINT FOUND 2 CIRCUIT BREAKERS OUT ON THE FO SIDE. BOTH WERE ANNUNCIATOR AND CTL TYPE BREAKERS. HOW; WHEN OR WHY THESE BREAKERS POPPED IS UNKNOWN. MAINT RESET THE BREAKERS AND DID SOME TESTING OF THE SYS; AND AFTER ABOUT 1 HR DELAY; WE DEPARTED ON THE NEXT LEG.