New member - 2001 7.3L Crank No Start

Hello,
2001 F350 7.3, Built Auto, 4x4, 285K miles – truck ran great right up until it died in the yard and won’t start. Cranks plenty fast. No CEL. No tach movement. No oil pressure movement. WTS light works. GPR cycles. From the Crank No Start flowchart – replaced the CPS with Ford Dealer sourced unit. No change. Found a wire scrubbed raw on driver’s side valve cover – repaired. No change. Full of oil. Oil in Hpop only down about an inch. Can’t pull any codes – power to DLC, but no comms. Tried three different scanners. Pulled PCM and tested pins 71,97 for KO 12v power – good. Pin 55 12v constant- good. NO GROUND on pins 25,51,77 and 103. I’m guessing my problem with lack of coms on DLC and Crank no start are related to no ground at PCM connector. I’ve removed and cleaned every chassis, engine and frame ground I can find. Where the heck is the primary ground source for the four PCM ground pins? Do they feed through another circuit? Can’t imagine they are ignition dependent. Anyone have a wiring diagram for the 2001 7.3 PCM circuit or know where the ground source might be? Or am I barking up the wrong tree? Truck does have an Edge programmer with a program loaded – however, with no comms on DLC, tuner just says “connecting to bridge” when I plug it in. Haven’t had it plugged in for several years. Truck has been super dependable. This is the first time it’s ever left me hangin’. Read every thread I could find on Crank no start. Looking for suggestions. Thanks in advance for any input! Be well!