As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF LEFT GEAR UNSAFE LIGHT REMAINED ILLUMINATED. COMPLIED WITH QRH AND LIGHT REMAINED ILLUMINATED. REMOVED AND REPLACED LEFT MAIN GEAR UP AND LOCKED PROX SENSOR (M827) IAW 727 WDM 32-60-01 SENSOR NEEDS TO BE REINSTALLED AND OP'S CHECKED. REPLACED LEFT MAIN GEAR UPLOCK SENSOR IAW 727 MM 32-61-081-4. OPS CHECK GOOD. OK FOR SERVICE.