What was found
OUTFLOW VALVE RIGHT EICAS MSG ON TAKE OFF ROLL STATUS MSG. UNABLE TO CLOSE OUTFLOW VALVE IN MANUAL OR AUTO. FOUND A BROKEN WIRE AFT SIDE CEILING. REMOVED AND REPLACED CABIN PRESSURE CONTROLLER B. OPS CHECK GOOD AT THIS TIME IAW AMM 21-31-02. REMOVED AND REPLACED L/H ICU DUE TO WIRES SHORTING UNIT OUT. OPS CHECK GOOD AT THIS TIME IAW B747 AMM 21-31-10. REMOVED AND REPLACED R/H ICU DUE TO WIRES SHORTING UNIT OUT. OPS CHECK GOOD AT THIS TIME IAW B747 AMM 21-31-10. REPAIRED WIRING IAW SPW 20-30-123.