Warranty coverage is unlikely through HoH. It depends on how old it is, and what serial number it is. The original ZNA was a 1 year warranty regardless of purchaser, based on serial number, and the later runs of the ZNA were 1 year for the original purchaser ONLY. Zen instituted these warranty changes because he was trying to discourage people from buying them and then selling them at a higher price. So either way, there will not likely be any warranty coverage on it at this point, since the ZNA was released more than a year ago, the new warranty would apply even if it was purchased yesterday, the new owner still would not be able to get warranty repairs. The best you could hope for would be to call HoH direct and ask if they would be willing to cover it under warranty. My personal experience with Zen is that he is very reasonable and fair, so you *might* have a shot at it, but no guarantees. The full details are on HOH website here:
http://houseofhybrids.com/warranty-service/warranty-service-request-form