As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UNABLE TO COMMUNICATE W/ DISPATCH VIA SATCOM. WE CAN RECEIVE AND CALL WE CAN HEAR DISPATCH BUT THEY CANNOT HEAR US. WE ATTEMPTED W/ BOTH CA AND FO ACP AND HAND MIC. GROUNDED - YES. CYCLED SATCOM C/B. PERFORMED SYS OPS TEST REF B737-800 AMM 23-15-00. ABLE TO COMMUNICATE WITH DISPATCH FROM CAP AND FO. ALL CKS NML.