Don't be afraid to ask Blue Circle even if you don't want to send it in. Contact Angela at BCircle@Bluecircle.com
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From personal experience, Blue Circle customer service (Gilbert or Angela) is first rate. I shipped my BC-21 to Blue Circle for upgrades (external power supply, upgraded caps, Shallco vol. attenuator) via FedEx Ground - no problems whatsoever. Communication was excellent.
Call or email Blue Circle. They are the best at servicing and voicing their product.