Had a couple of goes at fixing the dessicant plugs that came with the engine. Take #1, put the beads on a pizza tray and heated overnight in a fan forced oven at 90C. The beads were beautifully blue, but too hot to handle, and I had to go to work so left them in the oven. By the time I had got home they were pink again...
Take #2: same recipe, but left them to cool for an hour, then reinserting in the dessicant plugs and fitted to the engine.