As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, UPON SELECTION OF GEAR UP, GOT A GEAR DISAGREE MESSAGE. FOLLOWED QRH BUT THE MESSAGE PERSISTED. RETURNED TO YVR. FOUND OLEO CENTERED /EXTENDED PROXIMITY SENSOR OUT OF ADJUSTMENT. ADJUSTED PROXIMITY SENSOR IAW MM 32-81-05. OPS CHECK GOOD.