What was found
**EMERGENCY DECLARED**LE SLAT ASYMMETRY AT FL150. SPEED BRAKES EXTENDED. RAN CHECK LIST LANDED NOT SLATS/FLAPS 30 DEGREES. FIM 32-09 FAULT TREE 803 BLOCKS1, 2,3,4,14A,37,7,8. SENSOR S298 FAULT SHOWN INTIALLY. UPON INSPECTION FOUND SENSOR TO BE DIRTY AND OBSCURED. SENSOR S298 CLEANED AND PSEU ON GROUND SYSTEM TEST PERFORMED WITH NO FAULTS. FLAPS/SLATS CYCLED VARIOUS TIMES WITH NO FAULT. LE SLAT ASSYMETRY B LEVEL MESSAGE NO LONGER SHOWN. OK FOR SVC.