31. Installed #2 transponder P/N 622-9210-409 S/N 2376. Both transponders are still waiting operational checks after ADS-B mod is complete. Updated GIV CMP's 345305 and 345306. Performed this work IAW GIV AMM 34-02-04. Completed Performed ADS-B Out Ground Test Plan IAN Gulfstream Document No. SGER-459,