As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ACFT RETURNED TO BASE WHEN ALL LANDING GEAR FAILED TO RETRACT. THE CREW REPORTED THEY HAD 3 RED, HANDLE LIGHT AND 3 GREEN. MX FOUND THE PSEU FAULT CODES WHERE DIN01A UNREASONABLE FALSE AND DIN02A UNREASONABLE TRUE. OPS CHECKED OF THE LDG CONTROL LEVER FOUND IT TO BE GOOD. MX REPLACED THE STEERING CONTROL UNIT. (TC 20100219006)