As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB, WHEN PASSING FL300, HAPPENED RIGHT PACK TRIP-OFF LIGHT ILLUMINATED. CONTINUING CLIMBING, AT FL350 TWO BLEED LIGHT ILLUMINATED. USING FIM 21-52 TASK 825 AND FIM 36-10 TASK 801, EVERYTHING FOUND OK. BY FLIGHT TEST, AT FL230 HAPPENED AGAIN AND A RESET WAS MADE AND THE LIGHT TURNED OFF BUT CONTINUING CLIMBING AT FL270 IT HAPPEN AGAIN NA RESET AND THE LIGHT TURNED OFF. AIRCRAFT TECHNICIANS HAS REPLACED THE REFERRED PRECOOLER VALVE TO ANOTHER WITH S/N: 3901 AND FOUND OK. THE AIRPLANE STILL FLYING AND THE PROBLEM DIDN’T RISE AGAIN.