What was found
FLT 391 - CREW DISCOVERED DAMAGE TO TAIL SECTION DURING POST FLT INSPECTION. DAMAGE IS BELIEVED TO BE DUE TO TAIL STRIKE ON PREVIOUS TAKE OFF. MX R & R AFT BELLY SKIN FROM BS 908-1016 AND FROM STR 25L-25R IAW BOEING 737-300 SMR 51-40-02. REMOVED, FABED & INSTALLED SHEAR TIE AT BS 947 AND BL 0. REMOVED, FABBED REPAIR DOUBLER & INSTALLED REPAIR PARTS ON FRAME CHORD AT BS 1006 & STR 27L IAW BOEING 737-300 SRM 51-70-01-0G. R & I NEW STRINGER AT 27L FROM BS 908-1016 IAW BOEING 737-300 SRM 51-40-02. DFDR DOWN LOAD SHOWS THAT DAMAGE WAS CAUSED BY PILOT ERROR AND WAS NOT AIRCRAFT PROBLEM. SDR SUBMITTED FOR PRECAUTIONARY PURPOSES.