As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LT MAIN GEAR UNSAFE LIGHT REMAINED ILLUMINATED AFTER GEAR RETRACTION, UNTIL CLIMBING OUT OF 1500 FEET AGL. BOTH PILOTS HEARD A THUMP AND THEN THE LIGHT WENT OUT. NO FURTHER ABNORMAL INDICATIONS. PERFORMED GEAR RETRACTION TEST. FOUND LEFT UPLOCK SENSOR OUT OF LIMITS. READJUSTED. (M)