headlight door motor

[ernbuild]

Hi gents, I am having trouble with the headlight door motor. Replaced the bushes recently and both doors were working and L/H one is fine. R/H headlight works fine but door wont open or close. Have run through the diagnostics as set out in the manual and it says to replace the motor. However the motor works fine when I test it on the bench. Have exchanged the control module also and makes no difference. The motor is getting power according to my test light, but door will not turn. Works well when I do it manually. Am I missing something?? I dont want to invest in a new motor or module if there is nothing wrong with them, as getting out to Australia is a costly exercise if there is nothing wrong with them.
Any suggestions would be greatly accepted. Cheers Ernie.