just did one.
works great.
so here's the discoveries.
the pump "modules" have 4 parts, the main body, the outside bit, the inside bit - screwed to the main body, and the diaphram.
the failure is the inside bit, it has a rubber coating for some reason that becomes tacky and breaks down - contaminating the diaphram.
so you need to clean everything to get rid of all the tacky black stuff.
then reassemble it.
*BUT*
you must put the 2 screws into the assembly only finger-tight.
if you tighten it properly the valves dont work....
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