Click on these links to view past MedARKS records and zookeeper records on each elephants' medical/behavioral histories. Unfortunately, the "behavioral notes" seemed to have abruptly stopped after Feb. 2003.
Sunda:
http://www.helpelephants.com/records/Topeka/topeka_sunda_med_hx_07_08.pdf
(Note all of the comments of aggression between Sunda & Tembo starting on page 20 -- dates back to 1995 through 2008)
http://www.helpelephants.com/records/Topeka/topeka_sunda_spec_rep_07.pdf
http://www.helpelephants.com/records/Topeka/Topeka%20Sunda%20Medical%20Records.pdf
Tembo:
http://www.helpelephants.com/records/Topeka/topeka_tembo_med_hx_07_08.pdf
(Note more comments of aggression between Tembo & Sunda starting on page 11)
http://www.helpelephants.com/records/Topeka/topeka_tembo_spec_rep_07.pdf
http://www.helpelephants.com/records/Topeka/Topeka%20Tembo%20Medical%20Records.pdf