Thanks g8dhe and mikeonb4c for the rapid replies.

I have checked 30amp fuse - if the fuse is removed then the roof alarm remains silent; replacing the fuse and activating the roof switch then activates the alarm, but there is no noise from either motor.

Following your advice, I will exercise to ...

1997, 2.5 TD, with previously reliable AFT.

In attempting to raise the roof, the warning bleeper does sound, but there are no mechanical sounds from either of the roof motors, which would seem to point to either a failure of the roof control panel or an open circuit in the micro-switch controlling ...