RR do, but is this strategically the best option for an airline operating in a limited supply market. To avoid a mismash of engines, you ideally want to be with one supplier. If you go all legalistic with this supplier, will you get the best deal in the future. If you go legalistic, will you be at the front or end of the cue if you need additional engines or specialist assistance in the future? If you develop a reputation for being legalistic, will this assist or hinder your negotiating position should you decide in the future to change primary suppliers?
Will going legalistic even get you more compensation for the issues?
On balance its a bit like when your partner does something stupid - you want to get mad but often it isn't the best option.