What was found
WHILE AC WAS IN FOR HEAVY CHECK FOUND CENTER FUSELAGE 3 PAX CABIN FLOOR STRUCTURE, CORROSION FOUND AT RH SHEAR PANEL BTW FR 87-88 AND BTW RBL 12" TO RBL 40". AAR REMOVED AND REPLACED RH SHEAR PANEL PN 170-91919-001. IAW SRM 51-42-01, 51-42-03, 51-43-03. AC REMAINS IN YRQ FOR COMPLETION.