As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING REMOVAL AND REPLACEMENT OF (TIME CHANGE UNIT) NR 2 ENG PRECOOLER CONTROL VALVE FAILED INSTALLATION TEST IAW AMM 36-12-02 (PART G) VALVE IS OPENING HALFWAY. ACFT GROUNDED. PERFORMED LEAK CHECK OF NR 2 ENG BLEED AIR SYS SENSE LINES IAW AMM 36-11-00. FOUND PRECOOLER CONTROL VALVE CONTROL PRESSURE FLEX SENSE LINE LEAKING. R & R FLEX LINE. OPS AND LEAK TEST OF PRECOOLER CONTROL VALVE CHECKS GOOD IAW AMM 36-12-02.