Can a HOA board change the bylaws at their discretion?

What can be done when owners of the association that will not follow the rules in the by-laws?

I live in an 88 unit HOA where the current (less than a year) board has decided to decommission our buried sprinkler systems in order to avoid a $5 increase.

Do you have to be a home owner to be on the board of a condo association?

Who is responsible for replacing the overhead garage door? The HOA board, or the unit owner?

Can this crack be considered structural, and is it the responsibility of the HOA to repair crack and to reimburse us for water damage to the basement?