PLEASE HELP macbook pro motherboard corrosion

ok im based in ireland , have been having problem macbook pro few week there loud beeping noise - 3 beeps , break , 3 beeps repeat. spinning beach ball appears regularly , last extended periods of time. 2 minutes tat times. apple care mentioned indicator of possible ram problem , told bring 1 of certified repair centres brought in mactivate in dublin. did testing , couldnt find problem decided 1 replace 1 piece of ram , give me , if didnt replace other.

when opened found corosion of motherboard , saying result of liquid damage. no liquid has ever been split on or near machine. got laptop last july , have pretty guarded life since got it. no1 has ever used other me. said see liquid got fan said nothing has ever been split on or near it. drink near it.
how possible there has been liquid damage when there has never been split on it?
id appreciate advice on matter.

 

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it shows liquid of type has entered ports @ screen hinge area. moisture using in humid , cold area bringing warm space humidity condensed.
there number of reasons. have ever transported in backpack in rain?

apple not care how happened. sorry warranty void.

option claim lose on home owners policy, if have 1 covers such things.

 

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