It was identified that the screw which holds the retaining sleeve in place was missing.This allowed the retaining sleeve to move from its position and following the retaining segment to come out from the spring arm ¿ light bracket connection.As a result the light head detached and fell off.The missing screw was traced to an installation failure during previous service events of the light system.The light head was re-installed by the use of a new retaining segment and sleeve with screw.Based on this, no further actions are necessary.
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