What was found
AFTER SELECTION, NOTICED NO MOVEMENT OF FLAPS, CREW RESET FLAP CONTROL CB L7 WITH NO SUCCESS. OVERSHOOT C/OUT, FLAPLESS LANDING C/OUT WITH NO DIFFICULTY. AFTER INSP, RT INBD FLAP, OTBD (RT NR 4) XMISSION SHAFT FOUND SHEARED AT JOINT & CAUSE A FLAP POWER CAUTION LIGHT DURING APPRO. NOTE: ALSO ASYMMETRY MESSAGE IN CDS. SHAFT IN QUESTION IS ORIGINAL TO A/C, NEVER REPLACED SINCE A/C ENTERED IN SERVICE. NO SPECIFIC MX PERFORMED ON PART OTHER THAN GENERAL INSPS & FUNCT CHKS OF SYS. BOMBARDIER ADVISED SAME DAY & DAMAGED PART SHIPPED FOR INVEST. GENERAL VISUAL INSP OF ALL XMISSION SHAFTS (ALL FLAP TRANSMISSION SHAFT AND TORSION BARS REMOVED FOR INSPECTION) FOR INTEGRITY C/OUT, LUBE ALL FLAP BALL-SCREW ACT C/OUT.