What was found
DURING WALK AROUND AS PART OF THE PRELIMINARY INSPECTION OF THE AIRCRAFT FOR MAINTENANCE SERVICE, WERE FOUND 2 BROKEN FASTENERS ON RH WASTE SERVICE PANEL AND CORROSION AT LOWER AFT CORNER OF WASTE SERVICE PANEL CUT OUT. ADDITIONAL, CLAMP-SHELLS HOLDING THE WASTE DRAIN VALVE ASSEMBLY WERE BROKEN DUE TO CORROSION. AS CORRECTIVE ACTIONS, THE CORROSION WAS REMOVED, AND SERVICE PANEL REINSTALLED PER AIRCRAFT MANUFACTURER INSTRUCTIONS.