Robert, Parker SBT's operate exactly the same and use the same parts as a Parker SxS as far as the top lever staying to the right when opened. If you don't see the "trip" at the bottom of the receiver well, that's where your problem is. Are you sure it's not there??? It's not uncommon for the trip to stay depressed when the gun is opened if dirty, rusted, or the spring inside the trip is broken. If it is there, try using a small blade screwdriver to gently depress and release the trip with the lever over to the right, it's spring loaded so it should come up when the screwdriver is withdrawn. A small drop of oil on the trip may help as you work it. This small part (trip) is often left out or lost when the gun is reassembled after cleaning but you say the lever sometimes does stay to over to the right. If nothing works, take it to a knowledgeable gunsmith.
You'll know if the top lever mechanism is working if when you move the spring loaded lever to the right, the bolt retracts and when the lever swings back, the bolt comes forward. The trip when down engages a notch in the bolt and that is what keeps the bolt back and locks the lever to the right.
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