The manual is here. There is no service information available anywhere.
Claim in their 3 year warranty if there is a fault with it.
Mailing Address: JBL Professional 8500 Balboa Blvd. Northridge, CA 91329 Shipping Address: JBL Professional 8500 Balboa Blvd., Dock 15 Northridge, CA 91329 (Do not return product to this address without first obtaining prior authorization from JBL)
Customer Service: Monday through Friday 8:00am - 5:00pm Pacific Coast Time in the U.S.A. (800) 8JBLPRO (800.852.5776)
On The World Wide Web: www.jblpro.com
Professional Contacts, Outside the USA: Contact the JBL Professional Distributor in your area. A complete list of JBL Professional international distributors is provided at our U.S.A. website: www.jblpro.com
Product Registration: Register your product online at www.jblpro.com