What was found
LAS - AIR TURN BACK - FLT 421 - AFTER CLIMB-OUT, CREW REPORTED THAT THE NR 2 ENG OVERHEATED WITH AN EGT INDICATION OF 1130 DEG C FOR 2 TO 3 SECONDS WITH ASSOCIATED RED LIGHT. CREW REDUCED POWER AND EGT RETURNED WITHIN LIMITS. CREW RETURNED TO LAS AND LANDED WITHOUT FURTHER EVENT. MAINTENANCE PERFORMED BOROSCOPE IAW BOEING 737-300 MM 71-00-00/601 AND AMERICA WEST AIRLINES TASK CARD I5M72017. FOUND THE NR 2 ENG EGT TERMINAL BLOCK TOP STUD LOOSE ON THE INBOARD CORE COWL, 3 O'CLOCK POSITION. REMOVED AND INSTALLED NEW TERMINAL BLOCK ASSEMBLY. OPERATIONAL TESTS WERE GOOD.