As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AFTER TAKE OFF, ALL THREE GEAR FAILED TO RETRACT. (3) RED AND (3) GREEN LIGHTS REMAINED ILLUMINATED. RAN CHECKLIST, NO HELP. HANDLE DID ILLUMINATE AMBER. FLIGHT WAS DIVERTED BACK TO BASE. MAINTENANCE REMOVED AND REPLACED NLG WOW 2 CENTERING WIRING HARNESS. (TC NR 20070319009)