Unit 35: Moderate amount of dirt on condenser coils, washed out condenser coils. Contactor was testing within range. Start and run compressor amps were within range. Fan run amps were with in range changed air filter on the indoor unit. Blower motor amps were within range. Evaporator coil had a slight amount of dust buildup but nothing significant. Blow motor was starting to accumulate dust. Unit 36: Moderate amount of dirt on condenser coils, washed out condenser coils. Contactor was testing within range. Start and run compressor amps were within range. Fan run amps were with in range Unit 37: Moderate amount of dirt on condenser coils, washed out condenser coils. Contactor was testing within range. Start and run compressor amps were within range. Fan run amps were with in range. Could not complete indoor units for 36 and 37. We need a 12 or 14 foot a-frame ladder at least. 10 foot ladder or extension ladder is not enough.