What was found
WHILE A/C WAS IN FOR HEAVY CHECK FOUND AFT LAV MOUNT ON LT SIDE HAS BUBBLING PAINT LOC FR 90. MX REMOVED AND REPLACED THE PANEL SUPPORT ON LT SIDE FR 90 IAW EMB 170/175 SRM 51-40-02, 51-42-00, 51-43-03. P/N 170-86139-005. A/C REMAINS IN CMH FOR HEAVY CHECK COMPLETION.