What was found
STRINGER 32P AT -18.25 HAS CORROSION. NO CORROSION NOTED ON STRINGER LIMITED TO Z JOINT ONLY. REMOVED Z JOINT TO REPLACE FOUND TO BE OUT OF LIMITS IAW SRM 53-10-33-00-01 & SRM 51-42-05-02-01, REV 12. MATCH DRILLED NEW Z JOINT IAW SRM 51-40-07-02-01, REV 12 & APPLIED TOPCOAT IAW SRM 51-25-15-02-01, REV 12. OK TO INSTALL NEW Z JOINT. INSTALLED Z JOINT IAW Q400 SRM 51-23-00-00-01 + 51-42-05-02-01 REV 12. PRIMED RIVET TAILS, APPLIED TOP COAT AND CPC IAW SRM 51-25-10-02-01, 51-25-15-02-01 AND AMM 51-25-01-390-801 REV 40. APPLIED EXT PRIMER AND TOPCOAT IAW SRM 51-25-45-02-01 AND 51-25-15-02-01, REV 12.