What was found
SSI Z150-002 STRINGER 21L CORRODED IN SEVERAL SPOTS BETWEEN FRAMES FR88 AND FR89. (MAJOR REPAIR)) (LEVEL 2 CORROSION). REMOVED STRINGER 21L FROM FR 79 - FR 90, AND STRINGER SPLICE AT FR 79 - FR 80 REF EMB 175 SRM 51-40-08. PART# 170-91898-003. LOCATED, DRILLED AND TREATED NEW STRINGER 21L PER EMB 175 SRM 51-40-02, 51-23-04. RESTORED FINISH TO FASTENERS IAW E-175 SRM 51-23-05, 51-23-06, ENVOY ETN-EJ-51-025 AND ETN-EJ-51-015. REMOVED AND REPLACED STRINGER 21L FROM FR 79 - FR 90 PER EMB 175 SRM 51-40-08. LEVEL 2 CORROSION