What was found
ON THE GROUND INTERPHONE HAS PROP LIKE SOUND AND HOT INTERPHONE PILOT-TO-PILOT DOES NOT TRANSMIT. MAINT TEXT: REMOVED AND REPLACED AMU, NO HELP. RE-INSTALLED ORIGINAL AMU CHECK CABIN INTERPHONE CHECKS OKAY. TRIED TO RESET WITH FLT INT C/B, NO HELP NEED MORE TIME TO T/S. CLEANED INTERPHONE JACK AT EXT POWER PANEL OPERATED NORMAL.