D-Link DWL-2100AP won't bridge

We have two DWL 2100AP we use to take our network connection from the building with the modem (via switch to the first AP) across a parking lot to a second AP which connects to a switch to feed 6 computers. We used this for several years with the firmware v2.00. The switches and other equipment met the bridge mode requirements.

We lost connection to the second building in a way that could not be resolved by unplugging the router for a bit and restarting (as happened occasionally before..). Couldn't access either AP w/the user names/passwords we had "on file." So we did a reset and upgraded to firmware v2.13

We have had no luck in recreating the bridge mode using WDS, with SSID Broadcast Enabled, and the same SSID on each AP, and the MAC address (the one from the label which is also picked up by the AP Manager) for the other AP put in the Remote AP MAC address list, encryption turned off, all other setting factory default. Have tried varying channel, using a non-default SSID, using different SSID's for each AP, using different channels for each AP, etc. - they still won't see each other.

Each can be seen on the AP Manager on a computer it its buidling, the the managers cannot detect both AP. I can ping each one from a computer in its building, but I can't ping the other AP. Not sure we can see both from a laptop in the parking lot - I believe we could when we had them set as WDS with AP - I need to try the laptop out there again in just WDS mode.

We tried a functionality test using AP Client mode which allowed the signal to the remote AP, but only one computer (the one we were using to access the remote AP and is nearest to the AP) in the second building could get the signal, not the rest of the machine connected to the switch that connected to the remote AP.

We've tried everything suggested by D-Link. Any thoughts on how to rebuild this bridge?