After the playfield was removed and refitted, both flippers come up and stay energized as soon as the game is switched on.

Both flippers lock on at power-up after a teardown: reseat the flipper connector

Cause: A flipper connector that wasn't fully seated after reassembly.

Checks

• Check the flipper coil diodes.
• Go over every connector unplugged during the teardown.

Fix

• Reseat the flipper connectors (the right flipper one here).

Systems

• WPC Fliptronics

Games

• Bram Stoker's Dracula

Related tips

• Games that came with Type 1 flipper opto boards
• Flipper energises at power-on (Fliptronic)
• Flipper stuck up but drops when the power goes off
• Flipper stuck up and stays up with the power off
• Flipper energizes and stays up at power-on or game start
• Fliptronics flipper coil wired wrongly
• Earlier WPC flipper controller board connectors
• Fliptronics and WPC-95: weak flipper

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