Thanks to all who responded so quickly.
1) The parts manual is enroute, but I was previouly told that it doesn't identify that it has more than the single screw-on filter located near the pump.
2) No, the lock-out knob wasn't moved at all before it started acting up. And the knob has since been moved to full open, just to rule that out. When it was still somewhat trying to work I could pick the arms up and lock it in position.
3) I disconnected the hydraulic oil return line on the right hand side of the transmission and no screen was located: on either side of the transmission. I previously viewed the article on hydraulic oil changes prior to sending my request for assistance, and looked everywhere on the side of the transmission two more times for good measure.
Maybe the better question(s) are, "Is there a possibility of having two hydraulic filters on the particular "02" grey market tractor? Additionally, I partially d/c'd the high pressure line inlet at the 3PH and lots of air came out. After that, no movement at all. Was attempting to "bleed it" a no-no?