I have this exact kit and I'll be damned if the shutter speeds are within 25% range. It is a very robust shutter mechanism. Good luck with the sale, these are really extraordinary bodies and lenses.
I already have two of these or I'd bite. I would strongly suggest the buyer contact John Titterington to overhaul the camera. The camera would come back in perfect working condition. That is a much better route than buying an SRT-101 on ebay for much more than this one and then finding out it needs the same number of repairs or worse. Both of my SRT-101's were overhauled by John and I also bought an immaculate SRT-201 from him. He has very reasonable fees and does excellent work.