What was found
ON TAXI OUT RIGHT PACK LIGHT ILLUMINATED, WOULD NOT RESET WHILE PERFORMING QRH PROCEDURE. JUST TO COMING INTO THE GATE LIGHT EXTINGUISHED, BUT THEN WOULD RE-ILLUMINATE ON RECALL. GROUNDED-YES. PERFORMED BITE PROCEDURE, PER B737-800 AMM 21-61-00. TCV FAULTED, REPLACED RT PACK TCV, PER AMM 21-51-10. PERFORMED BITE PROCEDURE, GREEN GO LIGHT ILLUMINATED. GROUND VERIFICATION SUCCESSFUL.