It's just the cable (i.e. the regulator). Same happened to me. If it's grinding, the motor is working and you're hearing the broken cable scratch its way around the door.
I bought an eBay one for £80, replaced it myself and it's still going strong 2 years later. It's not a hard job, just a little fiddly.
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Porsche Boxster S Type 986
Bi-xenon Headlight Upgrade | 987 S 18" Anthracite Alloys | Android Head Unit | 5000k 55w HID's | 5000k Cree DRL's | 5000k Cree number plate lights | Cree LED Indicators | One-touch roof operation | Bypass exhaust pipes | Parking sensors | Ambient footwell lighting
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