Ok I dismantled the piezo, and took some pics. If my assumptions are correct I can see how the piezo buzzer functions, connecting to two contact points from the pcb.
When I removed the piezo disc the little black conductive buttons that feel to be made from rubber. One fell off and the other stayed attached to the piece of plastic. Perhaps the black conductive rubberized buttons have metal inside making them conductive?. (Similar to how the LCD connects to the PCB?)
I can see how the little rubberized buttons would be an area where solder contacts of the pcb would connect to the piezo disc through the little black buttons (which I assume must be conductive, I would need to try to test them with a DMM). however I'm unable to determine exactly what on the pcb can be considered to be actual piezo disc contacts?
How I'm suppose to replace what appears to be rubberized conductive buttons with new ones I'm uncertain.
I took a pic of an area of the pcb which appears ti line up with the two black buttons. After comparing measurements between two contact points on the pcb and two holes in the piece of plastic, both have a measurement of approx. ~13.5mm. (between each other)
Below is a pic of what I suspect are potential pcb piezo buzzer contact points, that appear to be normal soldering points that are rounded and not sharp or pointed.
pics of piezo disc, plastic holder and what appear as rubber mounts (black buttons).