Arrived on site to perform combo tune up on a 3 2007 weather king units. Client stated she just moved back into home and the whole house is getting remodeled. All 3 unit. Found 1 inch filter in return vents and pulled all of them out since they have a 5 in filter in attic. All 3 blower assembly are dirty from past years of dirt entering unit. Past owners did not do maintenance. All 3 secondary controls have been replaced. Motor are amping high and can fail in future as they get used heating and cooling. One motor is leaking a lot of oil from stress and age of unit. Igniter for found 2 igniter readying really high over 100. Advised these should be from 50-100. These can fail in future. Flame sensors have been replaced in past as well. Gas lines are good. Tempe rise is good on all 3 units. No protection on units and recommended adding protection to protect from electrical surge and power outages due to age and conditions. Cycled heaters. Washed all 3 condenser inside and out. Checked e