Under the WSA (Work Stoppage Agreement) The Union must agree not to leave an "unnecessary" work load...So if the work load is high, the Union must reduce the installation orders to a level the company deems fair.
The Union also agrees to assist in "technical issues" what ever that means. The Union must "assist" in any emergency declaration the company might declare. and again this is under the replacement contract.
There are plenty more and it's absurdly crazy, but if any of these agreements are violated, the Union will be held in account for unfair bargaining.