So I've been snooping through framework.jar anyways if you look through smali\com\sprint\util\Hiddenmenu.smali it has all the dialer codes and what they do right next to them. Now I didn't test them all because I bricked my last optimus v and returned another. But I did test this method and the dialer codes are in the same place in the sprint optimus marquee and they did work. Anyways if you don't feel like it here's the jist of what mine looks like.
Code:
DEBUG = "##33284#"
ERR = "##377#"
GPSCLRX = "##4773579#"
LG_DATA_HIDDEN = "##543282443336#"
LG_HIDDEN = "##5473784236368"
MEID = "##6343#"
PORT = "##7678#"
RTN = "##786#"
VERIZON_HIDDEN = "##7764726740"
VIRGIN = "##847446#"
VZW_DEVICE_INFO_HIDDEN = "#43574357*"