Can I get an instrument I bought elsewhere serviced by a specialist Indian instrument dealer?

Yes. KalaSudha services and repairs every kind of instrument it sells, wherever you bought yours and wherever you live: a sitar from another shop, a tabla brought from India, a harmonium passed down in the family. Send an enquiry with the instrument's details and what it needs, and KalaSudha replies with a quote and the arrangements. Strings, spare parts and cases for it come from KalaSudha too; see the instruments KalaSudha sells.