I do business with Autohaus Arizona in Tempe (800) 240-4620. Great customer service and reasonable prices (I ordered a couple of Bosch CPS units, just in case as of late). The auxillary water pump is the 010 unit. Their part number is 000 500 03 86 and runs $110.00 shipped. I couldn't believe the unit was failing after only 1,290 miles and it acted just like you are describing (I couldn't believe the RCM unit malfunctioned after 800 miles, either). So, to remedy the situation I ordered a new one for the black 6 and a backup for the graphite 6 of which I'll probably do a preemptive repair. R/R took about 45 minutes and was easy (basically, take off the pass. tire, inner quarter panel shrouds (careful with one push pin on the front fender), and there it is! Since its a stock replacement, it's just plug and play. Tools required are pliers, torx/star bits, and I think the bolt on assembly was 8mm. I lubed the rubber sleeve a small amout for ease of factory positioning. Ran like a banshee afterwards. Very minor fluid clean-up. Just make sure the two hoses are seated properly to ensure zero leakage. I posted some pix of the defective/disassembled oem Bosch pump in the general forum under "what did you do to your crossfire today." There's a "how to" posted for this exact repair on the forum. Use the search function, but really its an easy job. Thanks to all the great 6 owners here who make our lives as permagrin-ready as possible.