The FRONT part of the driver's seat's bottom does not tilt up or down anymore. All other seat adjustments work fine.

When I attempt to either raise or lower the height, I can hear the appropriate electric motor working, but the seat won't adjust. Its now stuck in a position where it is extremely uncomfortable for me to drive.

What likely problem am I looking at?

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'95 E300 Diesel, 264,000 Miles. [Sold it]