As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF AT 1000 FEET AGL HAD RED MANIFOLD FAIL NR 2, RTB IN ACCORDANCE WITH QRH. RESET MANIFOLD FAILURE DETECTION LOOP NR 2 CIRCUIT BREAKER. PER SMP. PERFORMED AIR TEST, PASSES PER MM 36-23-01-5. RAN NR 2 ENGINE OP'S CHECK NORMAL 181623 PER JRH. REMOVED AND REPLACED NR 1 AVIONICS INTERFACE UNIT PRECAUTIONARY PER MM 31-43-02-4. PERFORMED AIR PREFLIGHT TEST SYSTEM CHECKS NORMAL JRH INTERIOR CHECK.