My Glycol Pictures - forgive the crap point and shoot that I have I'm sure you can get the gist of it.

Healthy Crack on top:

Severe Clouding:

Horrible picture alert - Sheared off top polycarbonate fittings with several cracks from the threads to the pump housing:


These pictures do it no justice, its a mess and leaks like a sieve. Can't wait for my new one to ship!

As I sit now with one 4890 awaiting RMA: