I had an ouflow run to the fully open position passing FL330 in the climb.
SCCM came in to flightdeck a few moments before to tell us that the cabin/galley curtain was "blowing in to the cabin".
We started the change from climb to descent and she had no sooner left the flightdeck than the cabin started it's dramatic climb!!
We got all the warnings as the cabin climbed through 10K but still managed to get the aircraft below the altitude the masks deploy before they popped out. We descended more than 19000ft in less than 3 minutes.
Close run thing, but we managed it; probably helped having just done a couple of sims with a depressuriastaion scenario a couple of weeks before.