Hi Indu,
Normally if the https was provided by Tomcat, there should be some configuration about https in server.xml.
So I think first you need to find what service/application provided the https(listen to the 443 port).
You can use the "netstat -ao" in windows to find which process(PID) is listening to port 443. Then go to task manager to find the process by PID. Then I think you can go further to find the certificate.
Best regards,
Shuai Liang