You won't find leaked fluid if you look for it even with a 4x loupe. I know because I tried the same thing in vain. Then I slapped myself in the face, did the cap job, then found to my delight the cap job worked.
I know you still don't believe me even now, so please think about it logically. How old is that computer? How many years do you honestly think that a fluid filled "anything" can retain that fluid? And even if the fluid is retained, those fluid filled caps have degraded over the years. The only caps that don't are the ceramic and tantalum caps on the board. And that is precisely why we use mostly tantalum caps to replace those fluid filled caps -- all but the two big axial caps, which cannot be replaced by tantalums simply because tantalums don't come in such big capacitance sizes.
I know you don't want to do the work. Neither did I. But the fact remains that it must be done, whether you or someone else does it. I would do it for you, but I live in Japan and the cost of shipping would be problematic. But there are others here on 68kMLA who do such jobs for a fee. Just post a request and I am sure one of these dexterous friends will give you a quote. And once the job is done, you won't have to pay anyone to do it again. True, the two axial caps will need replacing again some day, but those would be easy enough for you to do. Even so, I doubt you would need to replace them for another 15 to 20 years.
