Gal.. from what I see.. Most prob the water seep in from the air con ledge. Most prob cos when they fix the compressor, they sort of moved the air con ledge.. and if the waterproofing is done long time ago, it may have hardened and it's not doing the job that it should be.
The water will seep in only when there's heavy rain one.. cos light and temporary rain won't 'forced' the water into the crack. I suggest you put a towel around the window where ur air con ledge is fixed. Monitor for the next heavy rain if it still happen. No point changing the laminate now if you can't find the source of the problem.
But must warn you first. If that's the problem, expect the problem to come back after like 3-5 years after you do re-waterproofing of your windows, cos the silicon they use as waterproofing will harden and lose its effectiveness. What's worse is that the compressor will vibrate when ur aircon is on, so it makes the 'gap' that is created even bigger.