The short circuit to ground may just mean also that the motor is stalling because the flap is jammed. doesn't necessarily mean that the motor is burned out... I got the same FM result, but when I removed the blend motor during the o-ring refurb. exercise and powered it up with a 9V battery : it worked very well... :D
It's worth checking out British Parts Range Rover ( P38A ) Parts and information - British Parts uk and Rimmer Brothers (UK) Rimmer Brothers - Triumph Car Parts, MG Rover Car Parts, and Land Rover Car Parts and Spares to see what's available...the A$ vs GBP is quite favourable at the moment ...and if you buy a few spares of the high value/low weight variety the postage costs are relatively low and you can still end up miles in front with the savings over what the local LR dealer probably charges...

