How to tear down the front cover of Olympus E-PL3?

Greetings.

I have a Olympus E-PL3 that was found recently with a serious swollen battery. It is so bad that even the SD card is jammed. I tried referring to E-PL1 and E-PL7 guides for disassembling, but the front and rear cover just can’t separate easily like what these online guides showed, even all visible screws were removed.

It feels like some where on the top panel is still connected. Or, are them bound together with strong adhesives? (Ever tried a heat blower but they were still inseparable.)

Any tips on tearing down E-PL3 are much appreciated.

Carl