Open the coin door and look for a button, it may be a small red button.
First press of the button tests nearly everything, lamps, sounds, displays, and coils - this should suffice for testing the coil
2nd does score display test
3rd does solenoid test . It cycles through the various coils, let it run and eventually it should fire the coil in question if the driver board, wiring, and coil are good.
4th is sound test
5th is switch test - I'd recommend trying this too. Remove all balls from the game and reset all drop targets. A display should read 0 meaning no switches are activated. Drop the ball in the outhole--a number other than 0 should now be displayed. If 0 is still up, you know it's not detecting the outhole switch.
6th press of the test button takes you to bookkeeping mode: how many games played, etc. You can keep pushing the button to cycle through bookkeeping until the game restarts in order to exit the test.
Edit: looks like my order is out of sequence. Refer to the diagram in the above post for your game. Same basic rules apply. Whichever red button cycles the tests is the only one i think you'll need to use