said by ctgreybeard: He was measuring 45 dBM at the demarc and 53 at the modem. He's going to let the powers-that-be know that it's marginal. They'll have to adjust the amp I guess.
That doesn't always indicate a problem, and they don't simply adjust the amp to change your upstream, they wish. Assuming 1-2db for your drop you are 43 at the tap. That is perfectly acceptable if 43 is supposed to come from that tap, if not it's a problem with a component failure or bad design, but you don't just adjust the amp. Maintenance will look at it to see if it's a problem with the plant. Repairs/modifications to your home wiring could later be needed to lower your upstream if/when it becomes a problem and the plant is deemed ok.