2007 SL550
I had the roof down and went for a drive, opened the trunk and then soft close did not work. I suspected leaks in the latch as discussed many times here before but not the case here.
Symptoms: So roof down, no soft close trunk, car would not lock and then I saw fuse 71 (20A) was blown. Red 'Close Trunk' warning on dash and red LED lit on door panel trunk open button. Roof would not raise.
I suspected it might be the latch leaking and needing epoxy but then the doors would not lock so I knew it must be the PSE pump.
I braced the roof up with a 2x4 and secured it with heavy duty straps so I could access the trunk to get to the PSE. I did not want to raise the roof manually as I am solo and it's very hard to do alone properly.
Pulled the PSE and opened it according to the great video from 'I Fix My Benz' on YouTube. Video here Saw the rotor was clean broken in half. Ordered a new one (must match rotation, in my case anticlockwise rotation) from Chrisoro (the same 'I Fix My Benz' guy) ->HERE<- for $97 delivered. (do not get the cheaper ones, they turn the opposite direction and may not work, also may not last)
Now I have to wait a week to get it but I figured what have I got to lose if I superglue the old rotor and try it while I wait. It was a clean break in half. So I super-glued it and put it all back together and it works! (follow the YouTube to get it to output 40PSI)
I only used it to close the trunk and put up the roof and lock the car because I will replace it with the new rotor when it arrives but at least for now the car is closed and secure.
I used a 15A fuse in slot 71 in case the superglue does not hold and the rotor breaks so I don't ruin the motor in the PSE. (I read somewhere it only pulls 6-7A normally)

 

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