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Transmission problem 850 1995

Transmission problem on my wife's '95 850. The tranny started "acting funny" and left her stranded. Engine runs but there is no output to the transmission. The car does not move in forward or reverse. The Check Engine light was triggered and I pulled the following codes from A1.
1-1-4 : Program selector open circuit or short circuit to supply.
1-2-4 : Mode selector fault or short circuit to ground.
3-2-2 : Incorrect gear ratio.
2-3-2 : Speedometer signal missing.
I cleared the codes and swapped the Mode Selector switch with a known good one. The car started to move a little and then the Check Engine light came back on. When it was able to move, I could move both forward and backward just a little - then nothing.
I pulled the codes again from A1, this time got just 2-3-2. Does not appear to have anything to do with the Mode Selector switch.
Where do I start troubleshooting the "Speedometer Signal Missing" problem or is that require specialized equipment?

Thanks in advance.






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