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Exchange -> Emergency breakdowns; swap the bad for the good immediately. Order Monday to Friday 9am to 4.30PM to ship same day! Repair -> Save money avoid paying deposit, keeping your own PSU with known history. Current clean, inspect, repair and test turnaround 24-48 hours (normal). Surplus -> Either for stock critical PSU's or for power supplies that are not repairable or exchangeable due to burn outs, corrosion, etc.