Completed annual maintenance on two rooftop package units, cleaned coils, inspected return filters which will need to be changed in fall when we service the gas side of the rooftop units 16x20x2, tested capacitors which both tested in range, all wiring components look good, amp readings normal, cleared condensate traps, tested pressures left side unit normal, right side unit pressures were low recharged unit with three pounds of 410A, tested pressures much better and temperature difference went from 5 to 16, system operational and working. Will need to bill customer for work performed.