Replace heat exchanger primary limit L140 - 30 Replace air filters 8- 20x25x2 Hotwire first stage heating at control panel for heating confirmation test after filter replacement and new safety switch installation. #10 system has exposed low voltage control wiring that could potentially short out or cause a no operation condition at any time. *Recommend replacing all UV damaged wiring and properly replace with new 18\8 installed in the proper weathertight conduit Upper roof walk around Most systems are either running in cooling mode or off at this time. #5 has completely clogged and matted over outside air economizer filters (see pics) #8 has partially disabled and disconnected economizer module that is exposed to the elements with dangling wires but is protected by the economizer hood at this time. Recommend seasonal maintenance on all upper roof systems ASAP including filter rotations and cooling system operational testing and maintenance.