What was found
SSI Z150-002 STRINGER 23L CORRODED BETWEEN FRAMES FR78 AND FR77. (MAJOR REPAIR) (LEVEL2 CORROSION). CORROSION ON STRINGER 23L BETWEEN FRAME 78 AND FRAME 77, FOUND TO HAVE 100% MATERIAL LOSS. LOCATED, DRILLED AND TREATED NEW STRINGER 23L PN: 170-91900-001 BETWEEN FR 74 AND FR 90 PER EMB 175 SRM 51-40-02, 51-23-04. RESTORED FINISH TO FASTENERS IAW E 175- SRM 51-23-06, ETN-EJ-51-015. REMOVED AND REPLACED STRINGER 23L AT FR-74 - FR-90 PER EMB-175 SRM 51-40-08. LEVEL 2 CORROSION