What was found
AFTER GEAR RETRACTION, AMBER "GEAR DISAGREE N" CAS MESSAGE APPEARED, FOLLOWED BY "GEAR DOOR OPEN" AND "GEAR CONTROL FAULT" AMBER CAS MESSAGES, AND THE AMBER HASH MARKS ACROSS THE VISUAL NOSE GEAR INDICATOR. RAN THE APPROPRIATE QRH CHECKLIST, GEAR LOWERED WITH NORMAL INDICATIONS, AND LANDED WITHOUT INCIDENT. CORRECTIVE ACTION: COMPLIED WITH BOTH THE SB 700-32-04 AND THE NLG ACTUATOR REPLACEMENT. INSTALLED NEW NLG ACTUATOR PN 9916321-1 SN 00243 IAW THE MODEL 700 MM, CHAPTER 32-30-10.