What was found
WHILE INSTALLING RUDDER, MECHANIC DROPPED A WRENCH PUNCTURING LEFT I/B ELEVATOR UPPER SKIN APPROX 18 INCHES FROM I/B END. REPAIR ACCOMPLISHED ON LEFT ELEVATOR UPPER SKIN APPROXIMATELY 18 INCHES FROM I/B END IAW SRM 55-20-01-1, SRM 55-20-1A1, SRM 55-20-2R-1, SRM 51-70-04, SRM 51-60-02-06 SRM 51-40-02.