mitsubishi ws 65315 wont power up/coolant leak

hello everyone, i need some help with a mitsubishi ws 65315 set i bought around 2004. it has always worked great up til a year ago. i would hit the power button and it would try to power up and then it would make a click sound and shut down. after reading up on it i took the back cover off of set and on the board in the center i found some liquid. i wiped  dry and bang, it came on and worked. since then i am having the same issues again. how do i replace fluid or lamp? it seems to be a type of coolant. thanks in advance 

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