I think this is a regular problem with the early Discovery 1 models, seems I've seen it mentioned before. Has anyone dealt with this problem already. I just can't budge the shifter and it seems to be out of reach from underneath??

 

http://home.twcny.rr.com/eeibooks/ro...codifflock.htm

 

There is also a good write up on DiscoWeb.
It is a hard repair.