As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
VERTICAL SPEED DOWN/UP WHEEL DOES NOT CHANGE VERTICAL SPEED. (V/S BUTTON OPENS WINDOW AND ANNUNCIATES V/S ON FMA, BUT WHEEL HAS NO EFFECT ON VERTICAL SPEED). GROUNDED - YES. CONFIRMED FAILURE OF VERTICAL SPEED WHEEL. REMOVED AND REPLACED MCP PER AMM 22-11-34-000-801/22-11-34-400-801. OP'S CK'S GOOD.