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P*994 Transducer Test 
If you enter 1 for this parameter it will continually fire the transducers, so 
you can check the wiring, until you press any key to cancel. 
P*995 Keys Test 
You should press each key, to confirm it works, with a counter showing how 
many more keys you have to press. Press the CANCEL key last, as this will 
confirm  if  all  keys  were  pressed  or  not.  If  they  were  not,  then  an  error 
message is displayed.