What was found
AIRCRAFT WAS GROUNDED. AIR INTERRUPT. EMERGENCY DECLARED. LANDING UNEVENTFUL. AIRCRAFT OVERWEIGHT. DURING TAKEOFF, THE F/O TRACK INDICATOR SWITCHED BACK AND FORTH FROM TRUE TO MAGNETIC. MAINTENANCE FOUND WIRE W011-0813-22 MISSING END CAP AND EXPOSED. INSTALLED NEW END CAP IAW SWPM 20-30-16. ACCOMPLISHED OPS TEST OF RT IRU IAW AMM 34-21-00 AND RT AND CENTER DCU IAW AMM 34-22-11. PERFORMED AUTOLAND TEST 30 AND TEST 40 IAW AMM 22-00-02. SYSTEM CHECK NORMAL.