AT&T MERLIN LEGEND Release 2.0 MLX Direct-Line Consoles Operator's Manual page 9

WARNING:
For your personal safety, DO NOT install an
MFM yourself.
ONLY an authorized technician or dealer
representative shall install, set options, or
repair an MFM.
To eliminate the risk of personal injury due to
electrical shock, DO NOT attempt to install or
remove an MFM from your MLX telephone.
Opening or removing the module cover of
your telephone may expose you to dangerous
voltages.
SAVE THESE INSTRUCTIONS
vii