Yep. There is an easy fix for this.

The problem is that the ramp is too wide where the ball kicks up to the lock. When the kicker kicks, the ball isn't guided up smoothly as it just has too much space to move and rattles around. I took a piece of self adhesive foam stripping (1/4" thick) and placed it on the left side of the ramp between the kicker and where the crossover ramp enters. In the picture below you can see where it was placed. This effectively narrows that part of the ramp keeping the ball going straight. Works 100% on mine.

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All WMS games were direct screen printed with the exception of a few games such as MB and CC. There are some exceptions (mainly backboxes) having decals applied to them for STTNG and RS. Early MB games did not use decals. You can do what you want, but I never remove original artwork and replace with a decal unless it was originally a decal.

Go to switch edge test and run the switches by hand to see if they register. That will clear the credit dots. Put tokens in the tubes and run coil test for right and left tube dispenser coils.

Make sure your coin door is closed during the coil tests or you are pushing in the white door buttons with one hand while using the black/red diagnostic buttons with the other or none of the coils will fire.

https://www.ipdb.org/machine.cgi?id=3782

The manual is under documentation just above the pictures. The coil test is under tests...usually test T4. The tube test is T18.