We had a thunderstorm here last week that damaged a couple of our electronics, including (sadly) my canon pro-4000. Although it was on battery backup/surge protection, I think it may have damaged the network card. Anyway, after calling Canon tech support, I find myself in the same position I was in years ago when I encountered a problem with my 8300... to service or not. Between the $1500 service call and $675 for a new head (which canon recommends purchasing just in case there is a problem with the current head) it doesn't make a lot of sense to spend money on a repair when a new one can be purchased for $2900. Especially true, since Canon tells me that the $1500 only covers parts and labor associated with the "diagnosed" problem. While my business insurance is covering the printer, it pains me to see an error code (EC51-3000) on this otherwise pristine printer. I read a post on here describing a method of entering service mode, but for the life of me can't get it to work. So, having exhausted any workarounds I can come up with, I'm left with deciding what to do with the printer. I ended up completely disassembling my 8300 as I wanted to understand how it was put together, but I don't plan to do that again for the 4000. I'm curious to know what others have done with these large printers.