Technician found system 1 has failed compressor with open windings due to start component relay staying open and melting. Will need to replace kickstart capacitor. Recover remaining refrigerant from system. Cut out compressor and filter drier. Braze in new compressor and filter drier. Pressure test and pull a deep vacuum. Charge to spec with 10 pounds 427a adding ac renew for oil return. Test operations. Expedite/urgency fees applied. Arrived on site and checked in with staff. Went to roof and removed failed start components replacing with truck stock KS1. Recovered refrigerant. Found black oil in gauge set. Removed compressor attached with rotolock fittings to find oil charge burnt and contaminated due to electrical failure. Performed flush through system removing as much contamination and oil as possible then flowed nitrogen through system for a final sweep. Awaited delivery of new compressor via emergency delivery. Compressor arrived and is not a direct match. System on roof using