Upon arrival found front left unit not dripping water. Checked RTU and found blower and condenser fan motors running but compressor 2 not running. Found no 24v present to compressor contactor. System had tripped on low pressure, found that the evaporator coil and drain pan needs to be clean. Debri is accumulating on bottom of coil and causing water to not drain into drain pan. Need to send estimate to Kelly. For approval.