At 74 with wonky knees I share your problem. I'd get a nice pillow, sit down with a nice alcohol free beverage. Put on your glasses, get a flashlight, grab some scale labels, and give it some time. Unhook & reconnect everything, labelling as you go along.
It's tremendously gratifying once you identify and fix the problem.
And make sure you have something to grab when you get up. Down dog in yoga practice is also a good solution to that particular problem.