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Thanks to all who have posted about 7.3 PSDs and their CPS problems. I read several days after getting stranded by my 99 PSD, until I settled on this as the most likely cause. Overwhelming amount of info, didn't have to bother anyone with questions as most problems have been written up long ago. Just gotta figure out who's got the answer I need.
Very consistent info and so I made the investment in a Borg Warner CPS today and plugged her in and my PSD is now growling like a BAD DOG again!
Now, just need to rebuild my confidence in it and get it back on the road again. 107,000 Miles and no prior maint. Need to clean it up from leaks on top now and found plenty ideas here.