I was able to finally scan again by downloading and installing the Brother iPrint&Scan app from the Brother web site. Windows Scan app mentioned by other users did not work for me.
Go to Brother support web site, type in your model, choose your operating system, and one of the software packages available to download will be iPrint and Scan
After first installing, it will only show the machines for which you have the scanner driver installed, (which is the problem here , it does not get installed by the regular driver package) but you have the option to add a machine, and it will find your machine on the network.
I don't know why Brother support does not tell callers about this!!!