The threaded hole on the power arm is where the small retaining bolt worked its way out and allowed the wrist pin to come out of the arm. There was moderate gaulling to the connecting rod and no sign of the bushing that buffers the wrist pin/rod.
The top end removed. This assembly is easily over a hundred pounds so watch your fingers. I was able to access and remove a couple hydraulic lines and all of the bolts after the seat was out and the rear fixed point assembly removed. the hardest part is removing the 3 point lift control lever...
It seems completely free at the top 30 degrees of travel and seems to rest mechanically at the working top end of travel. Have tried every valve configuration possible. These top arms are free. You can raise them and drop them against a hard stop that is near the top end of travel. Messed with...