As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT T/O GEAR RETRACTION LOUD VIBRATION TYPE NOISE COMING FROM NOSE AREA. NOISE BECAME WORSE WITH SPEED. FOUND RT HEAT EXCHANGER INLET AND OUTLET HEADER ASSEMBLY'S CRACKED. UPON DISASSEMBLY FOUND EXCHANGER FOULED WITH FEATHER. CHANGED HEAT EXCHANGER AND HEADER ASSEMBLYS IAW DC-8 MM CH 21-54-1. LEAK CKS GOOD.