What was found
AFTER TAKEOFF LT MLG PRIMARY & SECONDARY LIGHTS WERE RED WITH THE GEAR HANDLE UP. RAN QRH CHECKLIST & ALL LIGHTS WENT OUT INDICATING SAFE RETRACTION. LIGHT CAME BACK ON DESCENT. INTERROGATED PSEU IN CFDS. FOUND TWO OCCURRENCES ON LAST FLIGHT LEG OF LG UP & LATCHED A/B SENSOR DISAGREE PROBABLE CAUSE SENSOR & TARGET RIGGING. TROUBLE SHOT IAW FIM 32-60/807. DURING RIG CHECK OF SENSOR IN UP & LOCKED POSITION, FOUND LT MLG UP & LOCKED SENSOR INDUCTANCE AN OUT OF RANGE IAW AMM 32-61-15-5. CHECKED ROLLER GAPS ON LT MLG DOOR LATCH MECHANISM. HOOK & ROLLER ALIGNED & GAPS OK IAW FIM-SENSOR AT FAULT. R & R LT MLG UPLOCK PROX SENSOR RTS PASSED. CHA & CHB INDUCTANCE IN LIMITS. ALL INDICATIONS NORMAL.