Issues I've found so far:

1.) Hold bonus appears to do nothing if earned on ball 3. Bonus is not awarded twice as expected.
2.) I love the pseudo mystery award at the Tunes N Stuff saucer, but it's apparently not a mystery at all. The awards are given in a set sequential order each game. Meh. However, the points award CAN be doubled/tripled with a PF multiplier!
3.) Twice I had the game count bonus mid ball. I've never had trough issues on this game, so I'm curious if anyone else has had this happen or if I have trough opto problems.
4.) "OI Mania" mode from the TnS saucer. Didn't see or hear anything to give me the sense that it was doing anything.

Did put up a 474M game, even with mid ball loss (item 3) on ball 2.

Guess I'm having a coincidental trough opto issue with the ball loss. Just wanted to make sure no one else was seeing it.
The other "bug" I've found is a carry-over from previous versions. With the ball trapped in the cannon during Highway to Hell, when you come out of the lower playfield (Pre/LE), the cannon fires the ball randomly. This can easily lead to unfair drains. Player should have control over the cannon shot, maybe making a roving shot at the AC/DC targets, spinner, bell to give the player something to aim for.

Shrug, I thought my scores went UP after the code update. Been playing a lot of BIB and LTBR (neither of which I would have chosen before) as those shots, normally hit plenty accidentally during multiballs, build multipliers on your note shots. I've run up several 200-400M scores on what I would say is a PAPA-esque super fast premium. Nothing has changed with this game's play or being brutal. Backhand the left orbit/left ramp from the left flipper, backhand the right ramp from the right flipper. Good things happen. In fact, with -1 taken off each MB requirement, good things happen quicker. "Play better".