What was found
L/H AFT HOLE OF AFT DRAIN MAST IS ELONGATED (C-CHECK RO 5/23/2021) REMOVED DAMAGE AND INSTALLED DOUBLER PER REO 670-53-61-1870 IAW CRJ700 SRM 51-40-11, CRJ700 SRM 51-24-36 , CRJ700 SRM 51-24-16 AND 51-23-00, 51-42-06,51-42-21, REO 670-53-61-1256