What was found
AT 600' AFTER TAKEOFF RECEIVED ENG 1 FIRE INDICATION. COMPLIED WITH QRH, SHUTDOWN ENG, & RETURNED TO BASE. NOTE TO MX, FIRE HANDLE LIGHT & FUEL SWITCH LIGHT WERE NOT ILLUMINATED WHEN COMPLYING WITH QRH PROCEDURES. TROUBLE SHOT UPPER RT FIRE DETECTOR ASSEMBLY & LOOP A & B FAULT IAW FIM 26-11-01 FIG 103. PINS J & K AT FCDU P1-1690B READS 1490 OHMS, PINS J & K AT FCDU P1-1690A READS 1473 OHMS. NO SHORTS, BOTH WITHIN LIMITS. RIGHT UPPER TURB RESPONDER, DH7 READS 10100 OHMS, NO SHORTS, WITHIN LIMITS.