Thanks for all your suggestions, Hamwich was the closest! I had to remove the door panel or card held in place by about 8 small phillips screws, unscrew the 4 dome nuts(7/16th) and that allowed me to swing the door open but leaving the mechanism still attached ty the B post. I then drilled the 4 blind rivets on the back of the lock assembly, removed the backing plate and manually release the catch. The metal cam on the small locking lever had got jammed, so a good lube and put back in the reverse order. Total time, about 1 hour plus. There is always something to do on a Morgan!
