There is troubleshooting for the top relay in the manual, but I haven't found anything similar for the window. Since removing the relay makes the windows work, give this a try. I found a copy of the info from the manual posted on Justanswer . com
Here's the link: https://www.justanswer.com/porsche/3vq2d-own-2004-boxster-s-the-top-will-not-go-down-when.html
It shows the pin assignments for the relay carrier and 11 steps to check operation with a multimeter.
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I am not an attorney, mechanic, or member of the clergy. Following any advice given in my posts is done at your own peril.
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