Andrew arrived on time. He proved to be knowledgeable and efficient. I showed him the two problems: (1) a suddenly dim new LED bulb in the downstairs hall, on the same circuit as the new LED bulbs at the top and the bottom of the stairs, which were bright; and (2) an intermittently noisy bathroom ceiling fan/light. Naturally, just like when you take your car to your mechanic and it won't make that odd noise, neither of these two problems occurred when Mark first looked at them. He examined the wiring for the formerly dim LED bulb and pronounced it OK, so we concluded that the bulb was at fault and replaced it with another new LED bulb, which was bright. Next, he found that the bathroom ceiling fan/light motor was covered with talcum powder, causing poor performance; Andrew took it down, cleaned the motor, the trim, and the ceiling enclosure, and put it back all together - it is much quieter now. I appreciate Andrews knowledge and execution and will ask for him should I need electrical assistance again.