Keep us in mind when you get the repairs completed. I would like to know how everything went and how long it took. Mine is coming up on 3 years but every thing is still good.After 3 years of loyal service, my balanced jack broke last month. Not too much of a problem, I used the single ended jack. Now that's dying as well. Bluetooth isn't strong on this device when used on the go, so I've settled for using the USB audio out into my Momentum Wireless, which is fine. The battery life is still really good (especially when battery saving is activated), so I think I'll send it off to Romi Audio in HK for repairs and a jack upgrade in a few months (unless someone can suggest a more convenient route) when my Youtube Music free trial ends. I don't really have the money to upgrade to an R6Pro, X7ii or DX200, although I'd consider it in another year or two. Also, All of my current headphones are under 40 ohms impedance so I don't need anything truly powerful.
I think the DP-X1 actually has better headphone out sound quality than most DAPs? Why? Well, I don't believe that HR audio is audibly superior (although the mastering of HR titles is often done more carefully, it's not inherent to the format), so I use Standard def FLAC and high bit rate (+256) AAC for my audio library. This enables me to reduce the lock range adjust jitter setting to the second narrowest without skipping, producing a tight, detailed sound with amazing separation even on 3.5mm output. I think other DAPs are preset with a wider lock range, which helps with high res audio playback but degrades fidelity.
If I was on your situation I would get the battery replaced as well even if it's still ok for you. They have it opened and this would be the prime time to get it done.