As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT PLENUM AND HEAT EXCHANGER FOR THE PRIMARY BROKEN AND CRACKED. ACFT GROUNDED. R & R PRIMARY RT PLENUM AND HEAT EXCHANGER ASSY REF AMM 21-51-03-000-804-002 AND AMM 21-51-03-804-002, 21-51-03-400. PERFORMED HEAT EXCHANGER AND PLENUM/DIFFUSER INSTALLATION TEST IAW AMM 21-51-03-860-031-002, NO LEAKS NOTED.