What was found
DURING FLAP/SLAT EXTENSION, SLATS STUCK BETWEEN 15 DEG AND 30 DEG WOULD NOT RETRACT. FOUND RT WING NR 2 SLAT OTBD J/S, INBD SIDE TRANS SHAFT "U" JOINT SHEARED IN TWO. REMOVED AND REPLACED CHA1237-004A, S/N 0158, R & R FPPU REF MM 27-81-19-4. RII FOR INSTALL & OPS TEST REF 27-84-00-5. R & R LT WING APPU MM 27-86-11-4. LT PPU OFF MFG 9028A0002-01 SRL 1730 AND OFF MFG 9028A0002-01 SRL 1072.