What was found
NO GEAR INDICATION LIGHTS WHEN LANDING GEAR EXTENDED. GEAR CIRCUIT BREAKER POPPED. DURING CHECKLIST, WHEN C/B WAS RESET, MOMENTARILY GOT 3 GREEN LIGHTS, THEN C/B POPPED AGAIN. GEAR WAS BLOWN DOWN PER CHECKLIST. TROULBLESHOT SYSTEM, CHECKED POWER WIRES 1PC044-1- PC043, 1PC044-BP029, & GP1009-BPC029 FOR SHORTS TO GROUND WITH A MEGOMETER, ALL WIRES CHECKED GOOD. ISOLATED PROBLEM TO THE GEAR LOGIC PCBNZ004. REPLACED IT WITH A NEW UNIT. OPS CHECK GOOD IAW CE560XL WDM 32-60-01, 91-20-04 & MM 32-30-00.