Thanks for the heads up guys - I finally got around to doing mine today!
I used these Panasonic capacitors as hopefully they'll outlive me and the box:
https://www.amazon.co.uk/dp/B00U36LC...740111_TE_item
The hardest part for me was getting the old capacitors out as it's only the second time I've ever soldered but it's gone well and the box came up first time so I'll keep an eye out to see if I still get the random reboots like I was prior to doing this.
In my case only one of the caps was bulging which was the 10v one, but I replaced both anyway so fingers crossed for more reliable service
Thanks again for the heads up - it was much easier than I'd expected!