Ace Pelizon Plumbing was called out on a water hammer noise on hot water side for of dual sink closest to door and clogged sink with corroded drain piping. Ace Pelizon Plumbing found Angle stop for hot side was closed partially and causing water hammer issue (verified issue corrected when valve opened). Found brass la trap corroded along with pop up assembly. Recommend replacement of pop up assembly and drain piping under sink. Drain also needs to be cabled and cleaned at this time. Will present customer with options to repair. Will remove existing pop up assembly and drain piping under lav sink. Will install new pop up and ABS drain piping at this time. Ace Pelizon will restore water to fixture and verify drainage and flow at this time. Cabled and cleaned hallway bathroom sink drain.