What was found
AFTER TAKEOFF WITH GEAR RETRACTION WE GOT A GEAR DISAGREE WARNING MESSAGE NOSE GEAR RED INDICATION. PERFORMED GEAR EXTENSION/ RETRACTION IAW AMM 32-30-00. UPON RETRACTION FOUND NLG REAR DOOR HAD BROKEN OFF ITS HINGES. REMOVED DOOR AND PROCEDED WITH THE OPERATIONAL CHECK. NO MESSAGES NOR GEAR DISAGREE. OPS CHECK GOOD. PER EA CRJ932-07727 THE NOSE LANDING GEAR AFT DOOR WAS REMOVED. REMOVED AND REPLACED AFT NLG DOOR IAW AMM 32-22-05.