@carlsbad2 Your welcome. Yes, the process is difficult. All regulations are difficult, not just customs. State regulations more so because their codification scheme is less user friendly and at times simply unintuitive. In my experience entry was blocked at port weeks to almost two months simply because the logistics firm did not complete paperwork properly or put incorrect codes on the bill of lading. I read the code and guidance similarly- you are in the clear from both a fed and state perspective. The burden of proof includes the original invoice or shipping documents proving duty paid on original entry, the original shipping paperwork on first entry (bill of lading), the return shipping paperwork from you to Grimm, the Grimm invoice showing warranty repair no charge, the shipping paperwork (bill of lading) you received when shipped back, and an attestation of no value added. I have listed the complete package. You may not need all of the documents The most critical are original sales invoice, the recent invoice showing warranty repair no charge, and an attestation of no value added. I believe you, as the personal owner and re-importer can self certify no value added but the guidance implies it is best from the foreign repair company (Grimm). Be aware of a push back by officials if you self certify using only the Grimm invoice as proof. To error on stating the obvious, sincerity is the key to success in any conversations with federal or state officials
Yes, Grimm is excellent from both an audiophile and customer service/business perspective. Good luck again.
John