What was found
D:AFTER TAKEOFF SELECTED GEAR UP AND GOT A GEAR DISAGREEMENT WARNING MESSAGE AND A NOSE DOOR OPEN WARNING MESSAGE . FOLLOW QRH PROCEDURE ONE WE HAD 3 GREEN WE BURNED ENOUGH FUEL FOR A UNDERWEIGHT LANDING, AND RETURNED TO THE FIELD. / C:MEL 32-30-1 / CAT A DUE 11/FEB/22 / AFTER TAKEOFF SELECTED GEAR UP AND GOT A GEAR DISAGREEMENT WARNING MESSAGE AND A NOSE DOOR OPEN WARNING MESSAGE . FOLLOW QRH PROCEDURE ONE WE HAD 3 GREEN WE BURNED ENOUGH FUEL FOR A UNDERWEIGHT LANDING, AND RETURNED TO THE FIELD. (FLIGHT 5513 - FILED CLOSED) FEB 10, 2022 STATION: SMF--DEFERRED LANDING GEAR RETRACTION SYS IAW CRJ200 MEL 32-30-1 MX ACTION C/W PLACARD INSTALLED / CAT II DOWNGRADED