John F. Kennedy Center Act Amendments of 1979 - Amends the John F. Kennedy Center Act to direct the Secretary of the Interior, through the National Park Service, to include repair services among the services necessary for the operation of the Center. Directs the Secretary to provide a portion of the costs of such services. Credits tax-exempt contributions for specified events against the bond principal and interest due for parking facilities. Authorizes the Center to issue revenue bonds to retire the Center's debt to the concessionaire of the parking garage.