Quoted from va561:
When the ball enters any of the lanes in the pictures, it will make a short buzzing sound and that is it. Should it put points on the score board?
From your video, The lower In-lanes are not scoring. Under the playfield the switch contacts for the roll overs, could need cleaning or out of adjustment.
Could also be the sequence bank for the "1, 2, 3, 4". Switch contacts could need cleaning or are out of adjustment. Some of the 1,2,3,4, is working, though the bulb is out, on the upper number 1.
As the above comments from other Pinsiders the "Player Unit" is either physically stuck, or not getting a signal, to alternate from player 1 to player 2.
The game plays all 5 balls and then goes into "Game Over" successfully.