4WD light diagnostic codes

[Kendall83]

I ran the diagnostic and was returned with codes 11, 12 and 18 on my 2007 Path. I recently had my transmission rebuilt at AAMCO. Before the fix my 4wd indicator was working just fine. Now since they rebuilt the transmission it stopped working and the 4wd warning light stays on. All gears switch just fine. I've used 4wd many times since without issues. They told me to look up online and watch a video on how to reset the display myself but no luck. Hated that they were asking me to fix something that seemed to be their mistake. Not working with them any longer due to them being useless in the matter. Was looking for help on what these codes mean and how I can fix it. Vehicle is out of warranty so this is a job I'm hoping I can do myself.

[Hawairish]

To be sure, you ran the self-diagnostics for the transfer case as described on TF-53 of the FSM, correct?: http://www.nicoclub.com/manuals/Pathfin ... der/tf.pdf
(Full FSM: http://www.nicoclub.com/manuals/Pathfin ... Pathfinder)

On a cursory look, the FSM says this about those codes:
11-Clutch Pressure Switch
12-Line Pressure Switch
18-Wait Detection Switch

Seeing as they're all switches, did they plug everything back in on the transfer case?
Have you tried resetting the codes (per FSM, turning the truck off after running self-diagnostics)?
At any time (i.e., during use, or turning truck off after self-diagnostics), does the state of the 4wd light change?