I have VPCYB15AG Netbook, over 4 years old. This summer for the first time I have noticed higher than usual heating along the left side air vents and beneath. Is there anything that can be done about it? System monitoring apps show around 70 C (158 F) CPU temperature. Could this be happening as the laptop is now old? Is it easy to open the back panel (I have those screwdrivers) and clean the CPU heat sink, apply thermal paste etc for Y series laptop? Thanks.