As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE IN FLIGHT R WING SLIDE EICAS MESSAGE DISPLAYED. VISUAL AND AURAL OBSERVATION DOES NOT CONFIRM SLIDE DEPLOYMENT. GAINED ACCESS TO RHT WING ESCAPE SLIDE PROXIMITY SWITCH, FOUND SENSOR OUT OF TOLERANCE SHIMMED SENSOR TO .010 PER B757 AMM 52-71.