How is your return line? My friends return line didn't have enough elevation drop and it would get backed up from time to time.
Bad valve stem seals would not show up on a leakdown test. The actual seals themselves run about $11-15 for the set.
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Don't bother giving me "rep", I won't return it and I think it is stupid.
Gracie Barra Clearwater
Gyms in Clearwater, St. Pete and Port Richey
pm me if you are interested in trying a free class at any of the gyms.