What was found
CREW REPORTED, IN FLIGHT LOST LANDING GEAR DOWN INDICATION. ALSO, LIGHTS INOP ON LEFT HAND EFIS CONTROL PANEL, SELECTOR LIGHT INDICATION ON NR 1 COM CONTROL PANEL AND ADF CONTROL PANEL. EVERYTHING RETURNED TO NORMAL WHEN EXTERNAL POWER WAS CONNECTED. RAN BOTH ENGINES CHECKED ELECTRICAL POWER DISTRIBUTION GOOD. TRANSFERRED ELECTRICAL POWER FROM GEN 1 TO GEN 2 AND APU AND EXT POWER. ALL POWER SWITCHING NORMAL. INSPECTED GEAR INDICATION LIGHT SOCKETS, CHECK GOOD. WORK PERFORMED IAW AMM 24-25-00 AND 33-10-00.