What was found
RT BLEED TRIP OFF LIGHT ILLUMINATED IN FLIGHT, RESET TRIP, REILLUMINATED AT CRUISE 1, PSI AT 40, NR 2, PSI AT 10. ACFT GROUNDED. DIVERSION TIME-74 MINUTES. FOUND PRECOOLER VALVE INOPERATIVE. REPLACED PRECOOLER VALVE REF AMM 36-12-02-400-801. OPS CK, GROUND VERIFICATION GOOD REF MM 36-12-02-720-001. FOUND BLEED AIR REGULATOR CONNECTOR PLUG ATTACHMENTS DAMAGED. REPLACED BLEED AIR REGULATOR REF MM 36-11-03-400-801. BLEED AIR REG. INSTALLATION TEST COMPLETED, LEAK CKS COMPLETED. ALL TESTS NORMAL.