Screed (I think) repair

[justAgirl]

Hi,

I have just pulled up a laminate floor which was rising in the middle, underneath the membrane I've found two large lumps in the floor. From what I've read I think it is the screed, they sound hollow and are in one particular area. I wonder whether I now need to lift the whole screed layer or whether I can effectively cut out the lumps and patch repair the area (generally floor looks ok).
I am looking to lay a carpet afterwards so don't know if this makes a difference to what I do?
Dependant on what is recommended I would like the easiest solution (maybe self leveling?) if anyone could recommend a product that even a novice could lay.
Can anyone point me in the right direction.

Thanks a bunch!

 

[RedHerring2]

Perhaps this recent thread will help a little.
http://www.diynot.com/forums/viewtopic.php?t=235659
The screed, in sand/cement, needs to be about 30mm thick minimum, I believe, otherwise you're talking about self-levelling compound.
There's instructions in the 'sticky' section of this forum for self-levelling compound.