main parts that fail in routers, electrolytic caps,
and eventually wifi chipsets.
if they have been in a storm then sometimes a transformer or network chip or related ceramic caps
unless they are very high spec - like VDSL2 with atleast 5 gigabit ethernet ports, they arent worth touching.
you can get 5 port VDSL2 routers that are OpenWRT compatable and still new in the box on ebay for about €15
i have a couple.
