Radiator Seam Leak - top, 1989 Toyota Pick-Up

Hello, have an 89 Toyota Pick-Up, he's in great shape, just had a power flush-n-fill done on my radiator to prepare for winter, live in PA. The provider that I've been using for years told me that I have a slight seam leak at the top side (near battery side), advised me option to replace the radiator or might have to watch coolant level, make sure levels are full, bought Prestone 50/50 & check every few days have seen signs inside under the hood of small leaking, but tonight after getting home from work found few hours later approximately radiator fluid on my blacktop, about 4-6oz worth, what do you recommend that I do?

Thanks