What was found
(CAN) FLAPS SELECTED UUP FROM 15 DEGS. FLAPS WARNING ON CAWS, FLAPS SHUTDOWN AGAIN.PROBELM COULD NOT BE DUPLICATED IN HANGAR.FLAP COMPUTER ON ORDER FOR TROUBLESHOOTING. FLAP CNTL WARNING UNIT WOULD CAUSE FLAP FAILURE IN AIR WHEN FLAP SELECTION MADE. INVEST. REVEALED CODE E203 INDICATING DIFFERENCE OF 20 REVOLUTIONS BETWEEN LT & RT ROTATION SENSORS. FURTHER INVEST. REVEALED ROTATIION SENSE WIRES ALONG WITH A.O.A. SENSE WIRES CHAFED THROUGH IN LT WING AT WING RIB 2A. CAUSE OF CHAFING IMPROPER ROUTING OF WIRES. THESE WIRES WERE ROUTED OUTSIDE OF WIRING BUNDLE SADDLE AT RIB 2A & WERE ALLOWED TO CHAFE ON AIRFRAME.