If it were me, I'd buy a gently used unit from someone who accepts returns, and DIY the install.
If the unit is bad for whatever reason, it will trigger the same light you have on now and you'll go to plan B, otherwise, you've saved $600 -- for me, no brainer...
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"Betty" -- 2000 Boxster S, Triple Black, loaded except PSM (sold to a good home)
"Veronica" -- 2008 Boxster S, Arctic Silver on Blue
"Maleficent" -- 2007 Cayman S, Red and Black, TPC Turbo 3.6L 460 RWHP, H&R RSS Coilover / TPC stage 2 suspension
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