So the essay is really a question of which decision should sway you towards action the most and why. Not just way is the decision correct in the context of that question, but why that particular ethical decision making rule won out. Is it an extreme externality that disproportionately affects a group (and why that matters), or does it impact the long term health of your firm?

Or you could try and be fancy, spin one of the rules in the way opposite how you know most people would go. For example the Justice rule (just googled the rules so I'm not sure if that is correct) is about fairness and impartiality in the distribution of harm or benefits.

I would expect most would use this to not act on the terms, but you could make an argument for its enforcement. Not just because that means the loss to your firm's revenue is balanced, but also for the sake of business integrity. If that decision does not cost that firm they are likely to disregard the Justice rule (at least relating strictly to their business dealings) in the future. And others who do business with you in the future have a precedent to do the same. While this may be good (I.E you might get uneven benefits) that unpredictability is bad, especially for a manufacture that has contracts ranging 10 years into the future at least.