I don't know if your problem is indeed the stepper motor, but if it is, here's my 2 cents.
I replaced my stepper motor with the AC Delco one mentioned in the site, so far (1k mi) no problems. For the $50 it cost me (vs. $400 that my local LR "genuine" provider asked for), it was worth the experiment.
Comparing the new AC Delco part and the old OEM side-by-side, they have the same factory markings and both are "Made in Mexico".
I posted a string with pictures if you care to search...
Good luck!
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MG
'95 Disco I, 3.9L V8i 5-speed
Discoverying Bolivia...
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