Image shows part of top panel upside down and twisted round 90deg so the cables are not taut.

Remove recessed (red arrow) screw with a torx 10 screw head

Then the white plastic module containing all the electronics can be pulled rearwards and up, after pressing down the two similar catches (blue arrow). The catches can be released one at a time. When free, the module can be turned over to expose all the electrics (shown in next step)