Hi
mercedes sl 600 1998

I replaced the two windshield actuators
now my soft top is not working

When i closed the soft top manually, the switches light stay on and i can lock front and rear but the rear lock and unlock never stop If i do not release the switches,
I can unlock the windshield actuators and the unlock rear but the softtop stops halfway

when I open manually the soft , I reset the module and the switches lights turn off but the soft top does not move at all

I try to reset many times but sometimes the windows do not work at all

I went to a mercedes dealer they told me the computer said it is a limit switche not working properly but they don't know which one
They want 350.00 just to check which one

how I can know which one is not working
and how to fix

Thanks
herve
hdomange87@yahoo.com