As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT TOOK OFF, COULD NOT TRANSMITT FROM EITHER COMM. RADIO. FOUND PILOTS PUSH TO TALK SWITCH BROKEN, CO-PILOTS PUSH TO TALK DID WORK AND THERE WAS A HAND MIC IN GLOVE BOX. AIRCRAFT ALSO HAD A MODE (C) PROBLEM. AIRCRAFT RETURMED TO DEPARTURE, NR 1 TRANSPONDER WAS OK, NR 2 TRANSPONDER INTERMITTENT MODE (C) REMOVED AND REPLACED TRANSPONDER OPS. CHECKS GOOD.