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If you have BrassCraft valves under the sink, your problem may be here as the actual hole through these vales is about 1/8 inch when fully open.
Before you replace them try shutting off water again and draining the upstairs thourgh a downstairs faucet (taking off the airator so you sully this one) after it starts draining open up your upstairs faucets to let the crap move down to sink...it may work...but you may have to replace the BrassCraft Valves.
Gerry
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