What was found
WHILE FLYING FLIGHT ABX520 FROM HOUSTON TO SAN ANTONIO, GOT A LE SLAT DISAGREE CAUTION MSG ON DEPARTURE FROM KIAH. ACCOMLISHED QRH AND GOT LIGHT AND MSG TO EXTINGUISH. QRH DIRECTS TO LAND AT FLAPS 20, WHICH IS A NON-STANDARD LANDING CONFIG. EMERGENCY DECLARED TO BE ON SAFE SIDE. FOUND FSEU FAULT "LVR1 NOT IN DETENT" DUTRING BITE TEST IAW FIM 27-51 FT 809 PERFORMED LEVER SENSOR BITE PROCEDURE IAW FIM 27-51 FT 842 FOUND VOLTAGE OUT OF LIMITS AT MULTIPLE POSITIONS ADJUSTED SENSOR M604 TO BE BACK WITHIN LIMITS IAW B767 FIM 27-51-00/101 FIG 104A. AIRCRAFT RETURNED TO SERVICE.