Need help removing an old DNS domain

that wont go away 🙁
Long ago, at least 2 admins ago, we had a dns domain called companyA.com.
We now use CompanyA.local, but I keep getting Netlogon event 5781 events for companyA.com (cant register since no DC available).
I have tried several MS KB’s but so far I keep getting the warnings every 4 hours.
Its not a huge priority, but its messy in my logs.
Anyone have any suggestions?