Delicate handling doesn't always preclude loose boards. The simple test is whether tethering makes a difference. Items a-e will occur even if remote is off. If you're unwilling to "borrow" a handset cord from your wired phone to try tethering, then all I can say is mazel tov.
As stated in my above post, The Remote "Finds" the TUI with and without the use of a tether. The message displayed on the remote is as follows: "Found TIU Addr 1 With 0 AIU Boxes Connected". This is the case with both Remote/TIU pairs (Rev. L and Rev. G).