As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED THAT AFTER TAKEOFF THAT THE LG WOULD NOT RETRACT & THEY HAD A LG AIR & GND FAIL MSG. THE CREW ALSO REPORTED THAT THEY RECEIVED A SPOILER FAIL MSG, AN ENG 1 & 2 IDLE STOP FAIL MSG, GUST LOCK INOPERATIVE MESSAGE & THE THRUST REVERSER WAS NOT AVAILABLE. THE AIRCRAFT RETURNED TO FIELD LANDING WITHOUT INCIDENT. MAINTENANCE REPLACED THE LG ELECTRONIC UNIT. OPERATIONAL CHECKS WERE GOOD WITH NO FURTHER DEFECTS NOTED.