GPU temp probs after dis-assembly/reassembly

My Sony Vaio VPCEB34En laptop's CPU and GPU share the same heat sink and fan. I removed for cleaning purpose. After I cleaned my fan, I mounted them back. At first, the laptop didn't power up and the fans are not spinning. Then I checked to see whether my CPU is seated well and it wasn't. I fixed that well and now using the laptop. But the GPU and System temps from Speedfan were showing high temps. Here are the conditions:

Before dis-assembling CPU-GPU-Fan assembly (SpeedFan temps with one-tab browsing):
CPU 46-48 C
GPU 56-58 C
System 56-58 C
CPU Fan 4260 RPM (this was the highest recorded RPM even when playing games)

After dis-assembling and reassembling CPU-GPU-Fan assembly (SpeedFan temps with one-tab browsing):
CPU 46-48 C
GPU 65-68 C (at most went to 73 C)
System 65-68 C (at most went to 73 C)
CPU Fan 3700 - 4200 RPM (reached max of 5130 RPM -This might reduce bearing life :( )

So where did I made the mistake that made GPU alone go hotter but not the CPU?
 

dovah-chan

Honorable
Firstly I would have just used some canned/compressed air to quickly clean out a laptop fan. Secondly I would recommend that you check how tightly the heatsink is mounted to your GPU as the heatplate might not be making full contact with the package or you accidentally wiped off a lot of thermal paste. Only other think I can think of is that you punctured a heatpipe but if it was just cleaning that seems unlikely.