[W126 Coupe] Radio antenna

[Ronny 560sec]

I have a strange experience with the radio antenna of my 1987 560SEC.
My car was at the garage for some work. I bought the car with an after market alarm built in.
The former owner advised me at that time not to use the keys in the door locks but only the keyless buttons.
I also did that but the guys at the garage forgot what I told them and they were using the MB keys to lock and open the doors.
Of course when I picked up my car I noticed that the alarm was not working.
First we find out that they had removed the fuse from the alarm to keep that system quiet.
After that we discovered that 2 other fuses were blown up. We got the alarm working again and checked all the items from the dash.
Everything works except the car antenna. I switched the radio on, but the antenna was not moving up. Of course we tried the switch also, but nothing helps.
Is there somewhere another fuse?
Any idea what to look for?

Ronny 
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