My father left me his "Radio Control Big Hauler" set and I planned on running it on my G-scale layout on August 28th  in remembrance of his birthday. The remote was easy, I replaced the broken 9 volt connector.   The engine runs continously  (in ON mode); however, the remote has no impact on engine speed.  The lid to the tender's 9 volt space has fallen into the tender and the 9 volt connector is not visible.
1.  I need guidance / instructions on how to open the tender.
2.  It would also be helpful to have the set's operating instructions.


Thanks,
    Ed