What was found
PILOT REPORTED LOSS OF LANDING GEAR INDICATION PLUS OTHER LIGHTS. HAD TO DO 'GO AROUND' FOR TOWER TO CONFIRM 'GEAR DOWN'. MAINT INFORMED RT BUS FEED CIRCUIT BREAKERS HAD TRIPPED. PILOT RE-SET CB'S, GOT 3 GREENS. ALL OTHER SYSTEMS LAMPED, NO PROBLEMS. ONE OFF DIODE FOUND 'OPEN', 4 OFF DIODES REPLACED , 2 LT BUS FEEDS, 2 RT BUS FEEDS. REF BEECHRAFT KING AIR 200 WIRING DIAGRAM MANUAL 24-54-01, PG 3, ITEM DUAL BUS DIODE ASSY (NR 2) A135-CR1 AND CR2. THESE DIODES ARE CHECKED ON PHASE 3 INSP PER BEECHCRAFT MM CHP 24-50-00, PG 201. PHASE 3 WAS C/W 124.5 HRS PRIOR TO DEFECT.