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Make sure you really need to change the transmission. Tips do not frequently fail, but can exhibit symptoms of failure. I am not saying the shop doesn't know what they are doing, but just may not have that much exposure to Tips. It would be extremely hard to become an expert on Porsche Tip issues with very limited exposure. Are there any codes? CEL on? There are numerous things that can cause problems that do not require a new transmission. As an example, pressure regulator 4 can fail causing a CLC lockup not to work. This could be interpreted as slipping since the converter doesn't lockup as expected (about a $500 fix). Another example, if the brake light switch is intermittent, the automatic downshift does not work properly. Yet another, if a wheel speed sensor fails (P1710 right front or P1715, left front), then your tip shift buttons on the steering wheel will not work I chased this gremlin through wiring diagrams, fluid change, harness check, etc. Finally found it reading the OBD II section on Tip diagnostics, which is over 100 pages. After nearly a decade of metro traffic, I have only had the wheel speed sensor issue and intermittent brake light switch issue. You do have options for a rebuilt unit out there with the updated ZF parts. http://www.freddiestransmissions.com/html/zf_5hp19.html http://www.europeantransmissions.com/ http://www.drivetrain.com/parts_cata...smissions.html Please keep in mind, not all problems throw a light, but will produce a code. Codes that do not trigger a light : P0710 P0740 (note this code was thrown by faulty regulator 4) P1602 P1656 P1704 P1710 P1715 P1744 P1761 P1762 P1764 P1765 P1770 P1828 (short to B+ only, short to ground throws a light)1 point