I am working on Rheem split units which have A coils, they have access to one side of coil but the other side has no access . Is the only way to complete this is to cut my own access ? These have been installed about 8 yrs and out of the 23 I need to clean, 0 have the opposite side cut for access to the other side of the A . If this is the way to do it ,what would be the best way to gain entry to the other side ?