For US/Canadian customers, you would contact our US offices in Irvine, CA. Due to mandatory office closures in Orange County, CA, we are all working from home. You can call our support number, leave a message and a support member will return you call or you can email our support team.
We currently are doing no repairs in the US and shipping everything for repair to our headquarters in Korea. Average turnaround time is 2 weeks, but due to COVID-19, we are experiencing delays in customs clearance, so we are saying around 3 - 4 week, but in some cases they are coming back a lot sooner. Our support team is taking turns coming into the office for a few hours a couple of times a week to process RMA shipments and come in on delivery date to receive the repaired units back and ship back out to customer.
North America support info -
https://us.astellnkern.com/pages/contact-us