I was trying to prise open the case of the remote control for this unit which has part number N2QAYB000758. Under the battery there are 2 screws unlike most other similar remotes which have 4. However, in the same area in the battery compartment there appears to be 2 very small screws or something? Any ideas and as to whether these other things are relevant or is it safe to prise open without breaking the unit?