What was found
*** WHILE AIRCRAFT WAS IN FOR HEAVY CHECK *** MAINTENANCE REPORTED LEVEL 2 CORROSION ON THE UPPER WEB SHEAR PANEL AT FR 87-88, RBL 11-45. MAINTENANCE REMOVED AND REPLACED THE UPPER WEB SHEAR PANEL AT FR 87-88, RBL 11-45 IAW SRM 51-40-08, 51-40-02 & 51-75-16. AIRCRAFT IS CURRENTLY STILL OUT OF SERVICE FOR HEAVY CHECK COMPLETION.