You should be able to de-latch it from the case.
Once de-latched, you should be able to flip it over and see what is happening when you try to move the carriage. There's a good chance that something is jammed or a cable/rod is disconnected.
I managed to embed two 35mm scale figures inside without much issue. While I was letting bubbles shake out from the mold on my vibration table, I sacrificed an old brush to brush extra resin onto the models to prevent bubbles being stuck in the details.
This has been my go-to duck quote for decades.