In order to open up your sensor bar you need to remove 5 or 6 specialized "tripoint" screws.

There are 2 additional screws hidden under the double-sided tape on the bottom of the sensor bar. Here is a picture of one of the screws, shown after the tape is removed.

I did a search on the net for "tripoint" drivers and found a tool on the net for just a couple of dollars. The next picture shows the tool.