What was found
DURING CLIMB, NOTICED THAT ACFT WAS NOT PERFORMING NORMALLY IN REGARDS TO DECREASED ROC & AIRSPEED. TROUBLESHOT & FOUND THAT THE SECONDARY GEAR INDICATORS SHOWED THE LT MAIN GEAR TO BE STILL DOWN & LOCKED GREEN. PRIMARY GEAR INDICATORS SHOWED ALL THREE GEAR UP & STOWED. REDUCED SPEED & GEAR EXTENDED NORMALLY ON APPROACH TO LANDING. REMOVED LT MLG SECONDARY GEAR INDICATOR SWITCH & INSTALLED NEW SECONDARY GEAR INDICATOR SWITCH IAW AMM 32-60-00, OPS CHECKED GOOD.