What was found
(CAN) SHORTLY AFTER TAKEOFF CREW OBSERVED NR 1 ENGINE OVERHEAT - WHEN POWERLEVER RETARDED, IND. EXTINGUISHED. WHEN POWERLEVER FOR NR 1 ENGINE ADVANCED, OVERHEAT WARNING ILLUMINATED. CREW DECLARED EMERGENCY AND AIRCRAFT LANDED WITHOUT INCIDENT. CFR ON STANDBY. MAINT INSPECTION REVEALED NR 1 ENGINE OUTBOARD BLOWOUT PANEL FOUND OPEN & SUPPORT CABLE SEVERED. FURTHER INSPECTION REVEALED UPPER 13TH STAGE CROSS OVER DUCT RUPTUED. A WIRE TO UPPER FIRE LOOP SEPARATED & ALL PLASTIC/RUBBER SUPPORT FITTINGS AFT OF DUCT WERE HEAT DAMAGED. THRUST REVERSER FOLLOWUP CABLE ALSO DAMAGED. MAINT REPLACED & RESECURED FIRE LOOP POWER WIRES, REPLACED ALL NON-AIRWORTHY PLASTIC STANDOFFS/CLAMPS FROM 13TH STAGE DUCT.