ansponder ops checked good. Completed Corrected the strapping for the No.1 Transponder so it now outputs proper tail number N423TT. All work done IAW Rockwell Collins TDR-94D MM No. 523.0775657. Performed the ADS-B Out Ground Test Plan for the No.I and No.2 Transponders IAW Gulfstream Document No. SGER-459, Rev C