This is explained in detail under other forum topic:
link
What information is required in the case?
Team needs to perform troubleshooting. It is possible they will be able to fix this remotely, if not - troubleshooting visit is required
Where do you open the case?
Cases are opened here: https://www.solaredge.com/de/service/support/cases
How do you chat with SolarEdge?
Open page linked above and click Chating button in bottom tight corner. THEY SPEAK ENGLISH.
What types of tests are required (photos verifying the issue) before a RMA / case can be approved for replacement equipment?
Need to perform full troubleshooting visit
It includes voltage, continuity, isolation and physical damage tests.
What other information should be prepared in advance for a live chat with SolarEdge?
Site address, site visit summary, case #, RMA delivery address should be prepared in advance