Furnace precision tune up; clean and tune up furnace; clean burners, test ignition components, adjust gas level, test safety circuit, check indoor motors, checked all electrical components, tested indoor air flow, checked heating temperatures, and tested overall furnace operation. Duct pressure is pretty high on system. Looked at all returns in home, a few were blocked, moved a couch from the wall and made sure all others were open. Also checked all supply’s, a few were closed, opened them all up. Duct pressure did decrease a little bit. Would recommend adding a return in basement hallway and connect it to return drop. This will help reduce pressure and allow system to last longer. Would also recommend a surge protector and anode rod.