As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF DURING GEAR RETRACTION, LEFT RED A LIGHT AND RIGHT RED B LIGHT REMAINED ON WITH A LOUD GRINDING NOISE OBSERVED. CYCLED THE GEAR PER THE QRH AND SITUATION REMAINED FOR TWO CYCLES. ON THIRD ATTEMPT IT CORRECTED ITSELF. RETURNED TO LAX. REMOVED AND REPLACED LANDING GEAR SELECTOR HANDLE. CYCLED GEAR SEVERAL TIMES. NO DISCREPANCIES NOTED. OPS CHECKS GOOD.