Cleaned and serviced one oil boiler with MA, changed filter nozzle and strainer, vacuumed combustion chamber and around boiler, inspected all water components which no signs of leaks, boiler pressure normal, all six zones calling for heat , all circulator running, supply and return pipes are hot, inspected air handlers down stairs filters clean 20x20x5, inspected second floor air handlers those filters will need to be changed soon gave customer size 20x25x5, combustion and efficiency test was normal, customer renewed maintenance agreement, also customer would like us to give him a price to replace chimney metal clean out where flue goes into chimney had a leak and beginning to corrode away.