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I just finished repairing my spoiler after encountering some of the same symptoms as described. There is a reason Porsche doesn't offer parts for the mechanical assembly. It is very difficult to repair and the replacement is also expensive. Due to the heat and age in the trunk, the plastic posts that retain the micro switches for extend and retract positions can sometimes break or stretch out of position. This will give you the dash light issues due to never making the switch in either position. After investigating the cost of replacement, I decided to dive into it. What did I have to loose. Replacements are around $1,300.00. I was able to mechanically reposition and mount my switches with 4-40 pan head screws and nuts, and solved the problem. There are gear reduction drives with cable and rack gears in the assembly. Be careful if you try this repair and keep parts oriented properly because some are not interchangeable. I should have detailed this repair with pictures for everyone else, but I can probably do the job now in a couple hours.
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