As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT MAIN LANDING GEAR WOULD NOT COME UP DURING GEAR RETRACTION. TROUBLESHOT SYSTEM FOUND TO BE INTERMITTENT LEFT MAIN GEAR UPLOCK SWITCH. REMOVED AND REPLACED SWITCH WITH NEW, OPERATIONAL CHECK GOOD, ALL WORK DONE IAW CITATION 560 MM CHAPTER 32-61-00.