Had tested the PFD a couple months earlier by jumping in a pool... just to see what happens. It was quick and it inflated all the way, no problem.
After letting it dry out completely, I put a new CO2 on it and installed the manual inflator indicator.
Just this weekend I finally got around to inspecting and replacing the "pill." I took a good look at everything and it was clean, corrosion free and dry. Now it is also auto inflating. Seems to me that packing your own safety gear is on par with packing your own parachute... you take full responsibility.