As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING HEAVY MAINTENANCE, NUMEROUS HYDRAULIC LINES WERE REMOVED AND REPLACED. GROUND TESTING OF HYD AND LANDING GEAR SYSTEMS WAS CARRIED OUT. DURING THE FIRST FLIGHT AFTER MAINTENANCE, THE NOSE GEAR UP INDICATION WOULD NOT FUNCTION. MAINTENANCE FOUND AIR IN THE HYDRAULIC SYSTEM AND AFTER SYSTEM BLEEDING THE LANDING GEAR SYSTEM FUNCTIONED NORMALLY.