The up/down ramp stays down. In test the ramp coil only pulses up and down quickly, the slow hold action doesn't work, and the hold works only while the playfield is raised.

Up/down ramp stuck down: bad joint where the coil wire meets the diode

Cause: A poor solder joint where the coil's winding and diode meet the lug on the hold side, and the coil was mounted so tightly that it bound.

Checks

• Check voltage at all three lugs of the ramp coil.
• Watch the hold action with the playfield up and then down: if it changes with position, look for a cracked joint or a wire that moves.

Fix

• Resolder the joint at the lug, and refit the coil so it is held firmly but not clamped too tight.

Games

• Revenge From Mars

Source: Pinball Repair help group!! (Facebook group)