3rd Rail Loco with TMCC isn't responding to inputs, how to reset it?

[BigAl 956]

Found this on another Forum:

Lionel Reset Instructions for TMCC Engines.

STEP 1: Move switch on locomotive from run to program.
STEP 2: Turn on Command Base.
STEP 3: Place locomotive on track, then turn on power to track.
STEP 4: Press “ENG” then input locomotive ID#. Press “SET”.
STEP 5: Press ”ENG” then input locomotive ID# again.
STEP 6: Press “AUX 1”, then input the reprogramming code number that
corresponds to your locomotive. (See the chart linked).
STEP 7: Turn off power to track, wait ten seconds.
STEP 8: Remove locomotive from track, move switch from program to run.
STEP 9: Place locomotive back on track. Turn power on to track.
STEP 10: Press “ENG” and ID#, then operate as normal.

[panzerpete75]

A friend who owns a hobby shop has offered me a good deal on a Sunset Models/3rd Rail brass CN 4-8-4 with Lionel TMCC (from around 2009), but when another friend helped me test the locomotive with his TMCC system, the locomotive didn't want to respond to commands from the remote. However, it did run in conventional mode. We tried a few different numbers, but the wheels have absolutely no wear on them, so we aren't sure if the locomotive has ever been run, or was instead just put on display on a shelf.

Is there a way to reset the TMCC without taking the loco and tender apart? I really don't want to send it back to Sunset Models for them to fix it, unless I get a screaming deal on it. Thanks for any help.