I called two other plumbers I saw on-line that are based a tad closer to where I live - one couldn't get to me for a week & the other never called-back, so I expanded my search area & found Mr Monz. Initially I left a message, but surprisingly, he called me back within 5 minutes. And, he was able to get to me that afternoon. Problem drain fixed in short order.
The service call fee was about what I expected it to be as no parts were needed. I'd most assuredly call him the next time I'd need such services.