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Rolling when in park indicates the parking pawl is not fully engaging. If the tranny shifts okay and otherwise seems to operate okay, I suggest this is a simple ajustment of the mechanism that engages the pawl when you put the tranny into park. Best done by an independent Porsche shop.
I've owned a half dozen (all used) 911s. It goes through tires (especially rears) even if you are not a hard driver. So my view is purchase cost effective tires. I have used Kumho and certain other brands when on sale. I try and keep the cost/tire below $150 each. Tread depth is probably the single most important thing for wet adhesion. So the newer the tire, the better off you are. My most recent 911 - a '95 993 came with practically brand new P zeros and the rears have lasted only about 13,000 miles (and I don't drive hard). That is disappointing for an almost $200 tire.
What is the conventional wisdom about doing the 60k fluid change in a tiptronic transmission (in a 993). I've heard, over the years, if you don't have problems, and the fluid does not smell burnt, leave it alone. I've also heard change it as prescribed. Also, I'm not aware there is a dipstick with which to "smell" the fluid in the torque converter/transmission. If this is so, one would have to unscrew the filler plug in the unit, reach a finger in there, and then do the "smell test".
You can manually close the top. Behind each front seat on the side of the rear panel, you will see a plastic grommet. Remove the grommet. There is a bolt. Loosen the bolt on each side - just enough to release the top. YOu can then manually close the top. YOu can lock the top to the windshield header with a screwdriver - which is inserted into a slot just inside each fastening point. Then you can take the car to someone who can figure out what the problem is. My own 993 needed a control unit replaced (one on each side at the rear), plus there are some cables that need to be correctly adjusted.
I own a '95 993. It is a U.S. spec. version. It has OBD diagnostics on it. When I had a pre-purchase inspection done on it, the mechanic simply plugged his OBD diagnostic computer into the car. If you are asking whether you can purchase a scanner to read the OBD system on your car, I'm certain many of the parts supply houses carry them. Don't know the cost. Try whitney.com and do a google search.