The right re-circ fan was u/s, so the pack was operating in high flow. I heard a fairly large fluctuation in the aircon, so I looked at the overhead panel and the needle was further into the yellow than normal. Took a closer look and it was outside our flying manual limits, and still climbing. We descended 2000ft and it came within limits. No drama, wouldn't have worried if it was within limits but thought it should be investigated since our limit is listed as +/- 0.1 and it was 0.1 above that.
I drive both 75 and 76 - the press controls are certainly identical in all the aspects I can see.