As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED. R1 DOOR EMERGENCY EVACUATION SLIDE GIRT BAR WAS LEFT IN THE ARMED POSITION. CATERING OPENED THE DOOR FROM OUTSIDE CAUSING PARTIAL SLIDE DEPLOYMENT. SLIDE FAILED TO DEPLOY PROPERLY. REMOVED AND REPLACED SLIDE IAW AMM 25-66-01. OPERATIONAL CHECK GOOD.