As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, TRANSPONDER NR 1 REPORTED DIAG WITH NO ASSOCIATED NUMBER. ATC REPORTED NO ALTITUDE READOUT. SWITCHED TO NR 2 TRANSPONDER AND HAD NO REPLY LIGHT OR ALT INFORMATION AS REPORTED BY ATC. RETURNED TO PDX. RERACKED NR 1 TDR94 TRANSPONDER. INSPECTED CONNECTIONS. NO DEFECTS NOTED. OPS CHECKED NR 1 TRANSPONDER OK. REMOVED NR 2 TDR94 AND CAD62 AND CLEANED CONNECTIONS. OPS CHECKED SYSTEM. SYSTEM TESTS GOOD.