As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#2476, SJU-BDL. (AIRCRAFT PERFORMED AN AIRTURN BACK TO SJU) ACP ONE WENT INTO TRANSMIT CAP SIDE SPEAKER WOULD HAVE TRANSMIT TONER P.A. BUTTON INOP ON ACP ALONG W/ 02 MASK MICROPHONE. COULD NOT TRANSMIT AT ALL FROM ACP 1.' ; C/W TSM 23-12-00-810-828-A AND FOUND CAPT HAND MIC GETTING STUCK REMOVED AND REPLACED CAPT HAND MIC. OPS CHECK GOOD A/C OK FOR SVC.