Need manual for Harris TS21 butt set
 

I need something that identifies the functon of each unmarked button on
the orange handset
Dont want to do a trial and error to try to figure them out
Any help appreciated---Haris has been aquired by Fluke and it appears
they have discontinued support for this model (Site goes from TS19 to
TS22)
Thanks for any help---replying directly to email address would be
appreciated )
Bill