Makerbot Smart extruder+ heat block and nozzle question
Caveat emptor: This answer is probably not what you're expecting.

As far as I can make out after looking at this un-jamming video on YouTube, where at time 00:01:24, the video shows a label that needs to be cut to open up the extruder. However, as mentioned at the end of the same video, cutting that label will void Makerbot's warranty cover on the extruder.

From that, I can make out that Makerbot will actively discourage any efforts to disseminate the kind of information you're looking for, at least until the product is discontinued. That would usually include a DMCA takedown notice to Google to remove search engine results, as well as similar takedown notices to other places where such information is hosted. I expect you will not find such information easily.