It is an easy fix. Never bend anything that has not been bent in the first place.

You could remove the key and adjust the strength on the spring for that key.

You could use a heat gun to soften up the glue, slightly moving the pad to a better sealed position.

Replace the pad.

Even these minor adjustments make me nervous in the hands of someone that has no idea what they are doing.

I myself would suggest taping it closed with masking tape. Let someone who knows what they are doing work on it. High F can temporarily be avoided on Bari. How often do you need high F? About as much as you need low A.   Just put a piece of tape on the cup under the pad. No leak but no high F either.

Good Luck.