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Not sure if this helps with the windows and cruise control but...
If your Boxster is a MY 2000 your DME system is the 7.2 version according to the Bentley manual. The P1502 code is 'Fuel pump relay output stage'.
The 5.2 DME version lists the P1502 code as 'Throttle jacking unit spring test'.
You mention replacing things related to the throttle system. Have you check the fuel pump relay? It is located above the fuse box to the left of the 'double-wide' relay (convertible top relay) on the rop row.
Good luck.
derb
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