As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RT HF (NR 2 SYSTEM) TUNES WHENEVER MIC IS KEYED. PLZ RPLC THE ANT COUPLER PER MM. PCN 530-9045, PLZ CHECK WITH ONLINE IPC FOR PROPER EFFECTIVITES. REPLACED RT COUPLER PER MM. CHECKS OKAY. THERE HAVE BEEN 6 WRITEUPS OF SIMILAR OCCURRENCES. SAMC DEFERRED DUE TO NO TIME TO REPLACE HF COUPLER PER LM1684.