When I fired up the truck yesterday afternoon I got a CEL with the p0335 code: CPS !!
I went to NAPA last night to buy the 1/4" drive E8 socket for the CPS exchange and they actuallly had a CPS on the shelf for $67 !
So I didn't have to mess with my SLK to do a swap.
After locating the CPS on the ML320 It took me about 15 minutes to swap it out - thanks to this board.
The truck fired up at the 2nd time of asking and ran OK.
But this morning it took several attempts to fire up and I briefly saw the word error on the dash display. I'm still leaning towards the starter, anyone got any other ideas ?

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1990 300CE-24 (Gone but not forgotten)
2002 SLK 32 AMG
2002 ML320 (Gone)
1995 E320 Cabriolet