As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FLIGHT LEVEL 400, THE NOSE GEAR CAME OFF THE UPLOCK HOOK 6-7 TIMES. PERFORMED MAINTENANCE CHECKLIST AND FOUND NOSE GEAR OLEO OVER EXTENDED. DISASSEMBLED NOSE GEAR OLEO, RE-SEALED, REASSEMBLED AND SERVICED. PERFORMED GEAR RETRACTION TEST. NO DISCREPANCIES NOTED.