When we got on the roof we found both compressors running. The number 1 compressor had 3 in thick of ice around it. The bottom half of evaporator coil was solid ice as well as all the capillary tubes were froze together. I disconnected compressor so the ice could thaw. The compressor is running. This was same issues as last time other than filters dirty. They are clean since just replaced. The belt is tight on blower motor. The entire system is dirty as far as both coils. There may be a possible leak and low on MO99 or coils are impacted. I could not trouble shoot at this time so I am rescheduling and will need to bring MO99 in case of leak.