What was found
NR 2 DURING MANUAL EXTENSION CHECKS 0 HYD PRESS. NO NOSE GEAR GREEN LIGHT AND BOTH GEAR NOT LATCHED LT AND GEAR DOOR (RED) LIGHTS STAYED ON. CYCLED GEAR SEVERAL TIMES, NO HELP. RAN EMERGENCY CHECK LIST. RETURNED TO AIRPORT. REMOVED AND REPLACED NLG DOWNLOCK INDICATING SWITCH IAW DC-8 MM 32-60-0, OPS CHECKS GOOD IAW DC-8 MM 32-60-0, GEAR SWING GOOD IAW DC-8 MM 32-30-0.