If you don't need LCR and want it off, first you need to DISABLE it, then in the Trunk Numbering (7xx) you need to set TRK GRP 1 back to "9" and make sure the channel numbers for your PRI are members of the "9" group in 6xx. Usually they are numbered 701-723 but could be different on your system.
Before you do all of that, manually select a PRI channel by dialing it ie 701 or whatever they are numbered, you'll get dialtone then dial and make sure the call goes out.
PM me for specifics if your unsure.
