What was found
PA SYSTEM SCRATCHY AND INTERMITTENT ALONG WITH F/A PANEL CIDS CAUTION LIGHT ILLUMINATED. INITIAL CIDS RESET, NO HELP. FOUND SYS FAULT OF CAM CHPT. REMOVED AND INSTALLED CIDS DIR 1 REF AMM. CIDS FAULT CLEARED. FOUND FLIGHT ATTENDANT HANDSET SQUEAL AND FEEDBACK ASSOCIATED WITH GROUND HEADSET JACK. CLEANED JACK AND CYCLED HEADSET INTO JACK. BOTH FLIGHT ATTENDANT HAND SETS FUNCTION RESTORED. OPS CHECKED GOOD WITH NO FEEDBACK. RESET CIDS AT F-A FWD PANEL. ACP'D OPERATIONAL CHECK OF PA SYSTEM, AMM 23-73-00-710-005-A & MECH-GRD CALL AMM 23-42-00-710-001-A. BOTH SYSTEMS CK'D OK.