The U.S. Army is conducting market research to identify qualified sources for scheduled preventative maintenance, troubleshooting, and emergency on-call repair services for forty 400 Hz cycle converters at Tobyhanna Army Depot. A mandatory 48-hour on-site emergency response requirement applies. The anticipated acquisition strategy is a single-award hybrid with firm-fixed-price for preventative maintenance and time-and-materials for emergency repairs. The set-aside decision (Small Business versus Full and Open Competition) will depend on responses received. No budget amount is specified, and this is a sources sought notice only—no contract will be awarded from this announcement.