This community is truly a blessing and I really am thankful for you volunteering your time.
Following your instructions, I was able to access the cable modem/router, disable primary wireless network and set to bridged mode.
I then connected the Extreme, progressed through setup and created a wireless network.
I have tested via Ethernet port and also wireless and internet connectivity is working in that area of the house.
I still am dropping connectivity around the area of the house where I am trying to use hardwired AirPort Express.
Just a reminder, there is an Ethernet line in the wall from the Extreme (upstairs) to the location of the Express (downstairs) that we would like to use to set up the Express as wired. The line was used previously to supply internet to our LG tv.
Thus, we'd like to connect the Ethernet cable from the Extreme to the Express, and then a line out from the Express to the tv.
Hope this makes sense.
I will wait for your response before doing anything else to the Express. It is currently unplugged.
Thanks again!