My hot water starts with full pressure then quickly reduces flow to trickle at all household faucets. Already flushed water heater twice. Flow comes back temporarily once tank refills, then peters out again. No muck or discoloration in water. Cold water side has full pressure (even when Hot water tap is turned on) at all faucets. Plumber was in 2 days ago and replaced hot water line and valve under kitchen sink. He DID shut off water to entire house while making repair.