1997 Roadtrek 170P on Dodge chassis. Had this rig for about 18 years. Has always performed beautifully. Ordinarily, the back of the passenger seat will recline from about 10 o-clock to 2 o-clock range. But not today! The lever on the right side of the seat is stuck and refuses to budge, either UP or DOWN. (This is entirely mechanical; non-electric seat). It's not easy to see what is happening under the seat. And I'm of an age not to attempt taking the seat out to explore further. Who here can provide some insight or direction?