He meant that he carefully trimmed back all ends of all speaker cables and reconnected them. Speaker cables are made up of fine wires twisted together in a bundle. It's very easy to not notice that a single strand is sticking out from the bundle and is very close to or touching an adjacent speaker binding post, either on the amp or on the speaker. If it's not quite touching, the vibrations of the sounds in the room can make it touch intermittently. That will cause your receiver to trip off and flash its red front-panel standby light.
Personally, I use banana plugs. It's easy to work with them out in the middle of the room in good light, then plug them into the amp or speaker. Other people prefer soldering the speaker cables to "spade lugs". Working on your knees in the dark down behind equipment or speakers makes it easy to overlook shorts.
You also should check the full length of your speaker cables to make sure they have not been chewed on by pets or rodents (or pet rodents )
Thanks for the explanation. I will give it a try today.