ai6yr, Drat. Kitchen sink has a leak now. I wonder if it's because they loosed everything up but did not remove it. Think I'll fix this one myself, because:
A. doesn't leak unless you fill the non-disposal side of the sink
B. It's just one seal (tightened the P-trap and no issues there now)
C. The plumber charges more per hour than my own hourly rate writing software (!).
D. I will learn plumbing just to avoid the annoyance of dealing with caustic/flakey/expensive plumbers, in this case (easy to avoid this leak - not use that sink until it's fixed). Non-pressurized side of the plumbing system.