I am laughing and laughing at that damage deck. What was the #1 demand for a new damage deck? That all more upgrades could be affected. So what do the do? NO UPGRADES ARE AFFECTED.
The problem with Munitions Failure is that it's typically either devastating or pointless against any given ship, with very little middle ground. A deck that increased the frequency of Munitions-Failure-type cards (look! here's one for systems; too bad it's on a Y-wing. ooh, and next turn I'll fry the astromech slot on your Decimator) would be a disaster.
I rather suspect there are more than a handful of new cards in the updated damage deck.
Replacing all instances of 'discard a secondary weapon' with 'discard the highest costed upgrade currently equipped' would cover both bases discussed above...
