What was found
LT BLEED DUCT MASTER WRNG IN FLT CREW RETURNED TO FIELD. MX REMOVED AND REPLACED O-RINGS HEAT EXCHANGER TO CROSS BLD DUCT & CROSS BLD VLV, OPS CHECK AND LEAK CHECK GOOD.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
LT BLEED DUCT MASTER WRNG IN FLT CREW RETURNED TO FIELD. MX REMOVED AND REPLACED O-RINGS HEAT EXCHANGER TO CROSS BLD DUCT & CROSS BLD VLV, OPS CHECK AND LEAK CHECK GOOD.