Hi Frank. Thank you for your response and note on clarity.

When dysfunctional:
1) the gear selector and shift lever are functional and not binding, but I'll check for free-play at each gear selector and valve-body shift lever detent.
2) the transmission clutches will not engage except in gear selector positions R and 2

When Functional:
1) the gear selector and shift lever are functional and not binding.
2) transmission reverse and forward clutches engage in all R D 3 2 positions and will shift up and down normally.

Summary: Reverse works normally. Neutral works normally. There is no engagement when placed in gear selector positions D and or 3, except after starting in 2 and manually shifting up. 2nd gear engages immediately when placed in gear selector position 2. When upshift manually from gear selector position 2 to 3 and then D, the subsequent downshifts will not re-engage in 2nd gear, unless i move the selector lever down.

I'll research how to check complete accumulator. Thank you.