Unfortunately, there are no tricks to it. However, you are most likely correct that the connections are corroded causing them to not want to come apart. The only thing I have found that helps with this is to use a set of needle nose pliers to pull the connector apart. So you press down on the release tab and then a set of pliers on the other side of the connector and that will give you a little more leverage.
I am attaching the process to replace the tank in case others that visit this site need the instructions.
Let us know if there are other questions. Thanks
Images (Click to enlarge)
Saturday, May 29th, 2021 AT 10:59 AM