IMHO, you just had some bad or compromised valves. Sundstrand had a good design and it worked for 50+ yrs.
I am NOT an advocate of some guy rebuilding valves in his garage, I much prefer OEM factory fresh valve. It is your call though.
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Roland Bedell
CC Models: 100, 105, 1450, 782, (2) 784, & 2072
Buy: Made in the USA 
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