Arrived don site for no ac. Inspected drain line and found no issue there. Tested unit in cooling and noticed the outdoor unit would engage the contactor and run for a second or two and then shut off. Ohmed out compressor and got 6.5/6.5/5.5 with no resistance to ground. I then tested line voltage and got 490 at all three legs going into contactor and coming out of the contactor on line one and three I measured .3 volts. This indicates the contactor is not making a good connection and is dropping a leg of power and is unable to run the compressor. Checked warranty status 1 yr expired. Building manager approved replacement. Will return with part for repair today.