What was found
FLIGHT 2021. ON TAKEOFF, MOVED GEAR LEVER UP TO RETRACT GEAR AND GOT "LG LEVER DISAG" MASTER WARNING GEAR REMAINED DOWN. RAN CHECKLIST AND MESSAGE CLEARED, LANDING UNEVENTFUL. REMOVED FROM SERVICE. FERRIED FOR REPAIRS. CHECKED AIRCRAFT HISTORY AND FOUND LANDING GEAR SELECTOR VALVE WAS REPLACED FOR SAME DISCREPANCY ON 08/04/25. CHECKED VOLTAGE AND GROUND INPUTS AT LANDING GEAR SELECTOR VALVE CONNECTOR PO743. GROUNDS CHECK GOOD AT 4 TO 5 OHMS. VOLTAGE CHECKS LOW AT 7.91 TO 7.9 VOLTS DC. PER CONVERSATION WITH HORIZON ENGINEERING AND EMBRAER ENGINEERING, DETERMINED VOLTAGES TO BE NORMAL AS AS EXPECTED. REPLACED LANDING GEAR CONTROL LEVER.. CHECKS GOOD. RETURNED TO SERVICE.