As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PHX - DIVERSION - FLT 0546 - WHILE ENROUTE FROM LAS TO DFW THE R/H WING TO BODY OVERHEAT LIGHT ILLUMINATED, AIRCRAFT DIVERTED TO PHX. MAINTENANCE INSPECTED THE R/H PACK BAY AND FOUND 2 LOOSE/LEAKING CLAMPS. A FOLLOW UP (FUP) WAS ISSUED FOR A PNUEMATIC DUCT AND OVERHEAT INSPECTION TO BE ACCOMPLISHED (T/C'S 18M36003 & I8M36004). FOLLOW UP INSPECTION IDENTIFIED THE R/H PRIMARY HEAT EXCHANGER CRACKED, REPLACED PRIMARY HEAT EXCHANGER IAW T/C R2C21004, OPERATIONAL CHECK WAS GOOD.