What was found
SJO - FLT 631 - DURING CLIMB, ANTI-ICE ON NR 1 CAPTAIN PITOT PROBE WENT INOPERATIVE, AND AIRCRAFT RETURNED TO SAN JOSE. AT SJO, TECHS PERFORMED ANALYSIS PER AMM AND FOUND UNSERVICEABLE THE NR 1 PHC. NR 1 PHC WAS REPLACED PER AMM 30-31-34, AND AS PREVENTATIVE ACTION, REPLACED THE PITOT PROBE P/N C16195AA PER AMM 34-11-15. GROUND FUNCTIONAL CHECKS WERE SATISFACOTRY AND AIRCRAFT RETURNED TO NORMAL OPERATION. (M)