Pegula tried to get the county to pay for both and they said no, that isn't the terms of the lease, then Pegula paid for it.
Upgrades at KeyBank Center could cost more than $150 million, according to industry experts. While few dispute the arena needs major improvements, who pays for them is another story.
buffalonews.com
That is very different from saying they are obligated to replace scoreboard every 10 years or whatever.
For reference on the scoreboard, even a cheapskate like Golisano replaced his after 10 years, within manufacturer recommendations. As somebody who works in proAV, it is not very common for professional sports teams to keep their stuff for nearly double its life expectancy.
Professional sports venues aren't your grandmas living room where they keep a wooden zenith on the floor because "it works fine".