A WDB ACR FLC MADE A GAR WHEN THE LNDG GEAR GREEN LIGHTS DID NOT ILLUMINATE AND THE GEAR WARNING HORN SOUNDED CONTINUOUSLY. WHILE THE FLC DIVERTED; THEY OPENED AND RESET A NUMBER OF LNDG GEAR CIRCUIT BREAKERS; AFTER WHICH; THE GEAR WORKED NORMALLY.

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CONDUCTING CAT II ILS APCH AT FRA (GERMANY) RWY 25R. WHEN THE GEAR WAS LOWERED WE OBSERVED NO GEAR UNSAFE NOR ANY GREEN GEAR DOWN LIGHTS. THE GEAR WARNING HORN WAS SOUNDING AND COULD NOT BE SILENCED. WE HEARD THE GEAR EXTEND; BUT WE WERE UNSURE OF THE STATUS OF THE GEAR. THE GEAR HANDLE WAS IN THE FULL DOWN POS AND PRESSED DOUBLE CHK. THE DIMMED SWITCH WAS PRESSED AND WE NOTED A CHANGE IN THE THRUST RATING COMPUTER LIGHT INTENSITY; BUT NO EFFECT ON GEAR LIGHTS. A MISSED APCH WAS EXECUTED AND THE GEAR RETRACTED IN NORMAL FASHION. AS THE WX WAS AT ABSOLUTE MINIMUMS AT FRA; WE MADE THE DECISION TO PROCEED TO CGN; WHICH WAS CLR; IN THE EVENT WE HAD TO CONTEND WITH A SERIOUS GEAR PROB. I BRIEFED THE LEAD FLT ATTENDANT AS TO THE PROB AND OUR INTENTIONS ENRTE TO CGN. MYSELF AND THE CAPT REFERRED TO THE COMPANY OPS MANUAL; BUT FOUND NO PROC FOR THIS PROB. WE WENT TO THE SUPPLEMENTAL SECTION TO FIND CIRCUIT BREAKERS ASSOCIATED WITH GEAR LIGHTS AND WARNINGS; NO CIRCUIT BREAKERS WERE OUT BUT THE FOLLOWING WERE RESET; 'SEC 32 -- LNDG GEAR AND BRAKES;' P-1; S-1; C-12; AND E12. WE THEN LEVELED AT 10000 FT; SLOWED TO 220 KTS; AND LOWERED THE GEAR. THE GEAR FUNCTIONED NORMALLY AND 4 GREEN GEAR DOWN LIGHTS. WE RETRACTED THE GEAR; PROCEEDED TO CGN AND LANDED WITHOUT INCIDENT.