Has the Bureau of Meteorology been caught changing data?

B.O.M. bureaucrats have a made an art form out of spewing gibberish rubbish in response to Senate estimate questions. Needless to say they refused to answer my question as to why they don’t provide supporting evidence for their statistical changes that occur outside of changing equipment or moving locations. It’s bad enough they only did parallel runs on 5 out of 112 Accorn stations when they changed Stevenson screens, but to change data without supporting evidence is poor quality assurance and in complete violation of the climate monitoring principals.