Anbyody else have this problem? When the ball drains in the lower/Hell playfield, instead of popping it back up the machine sort of "loses" the ball and does a ball search. It doesn't actually pop it up sometimes... just forces me to wait for the lower playfield timer to expire. I try shaking/tilting to get the ball into a sensor or the like, and it doesn't do anything.
Anybody have this happen to them? Any solutions?
(Note: This is a Luci, if it matters)

Machine is very new.
Alright, I'm a repair n00b. Assuming I can test the opto board switch test in the menus? If it is acting up, anybody have any more specific info on what I should do/how to get to it? I'm pretty green at this, so appreciate any guidance!

Thanks all! And @85vett, I'll let you know tomorrow what I come up with (too late to test tonight).
Really appreciate the community support!