Galaxy 2-44 alarm nightmare

Hi guys , can anyone answer this query for me please , can the galaxy 2-44 alarm be reset if a managers code and engineers code is lost/unknown .
The premises that I rent has this alarm installed and the keypad just reads out engineers code required and when I try and access it with 12345 , the message unauthorised access not allowed comes up whenever I try and access areas 48..50...and 51 to reset it .., any advise would be great please as I'm worried sick in case it gets broken into thanks again

Brian ( hutchy36)