any gas station na may service station kaya mag palit ATF.
pero try mo sa Alpha sa Marikina, may machine sila dun na hihigupin lahat ng ATF na nasa loob ng case. unlike yung drain lang, may natitira kasing luma na fluid.
i think all honda automatics have non-serviceable filters. the transmissions are sealed, so you can't access the filter screen inside, unlike ibang kotse.
baka kulang lang yung fluid. or baka mali yung nilagay mo nun (patay ka...). honda transmissions require atf-z1 fluid from honda lang. if you put those fluids you can buy sa gas stations it will break (not agad agad naman), guaranteed.