回复：I suggest

oil pan leaking: do not do it unless you see oil on floor
water pump leaking: do not do it unless you see coolant on floor
fluid for cooling system is dirty: may consider, or wait until 60k miles
fluid for transmation is dirty, need flush or replace: No.
Battery poles corroted: clean poles your self
ENGIEN AIR FILTER要换: change yourself
Cabin air filter要换,这个是俺唯一个可以自己动手做的:)