What was found
PDIS 663 32-20 1528 11SEP19 MEM OPEN U LOGPAGES:2636365 AFTER GEAR RETRACTION THE NG DOOR LIGHT REMAINED ILLUMINATED. VIBRATION INDICATED THAT THE DOOR WAS OPEN. PER GOC RETURNED TO BASE AFTER RUNNING QRH SHGN 11SEP19 11:28 MEM U DEBRIEFED CREW AND CREW STATED THAT THEY SWITCHED FROM SYSTEM 1 TO SYSTEM 2 AND DOOR LIGHT REMAINED ILLUMINATED. FACT 11SEP19 19:52 MEM USING TSM 32-61-00 F.102. FOUND ONLY NLG DOOR INDICATION ON GLARE SHIELD TO BE ON WITH NLG DOORS CLOSED. ISOLATED FAULTY SWITCH TO 37GB. R/R SWITCH IAW MM 3200-00-04. OPS CHECK GOOD. SWITCH PN IS 140FL01B3Y1 SN UNK.