Hi there, we have at our site the above 12t Samuk forklift, recently an amber warning light has come on the dash which i think is transmission fluid level as it comes on straight away when the engine is started and still cold. I cant seam to find any way of checking or topping up the transmission oil or what type of oil to use as cant find a manual for this forklift anywhere on the internet. Ive found a plastic white dome on top of the transmission which i think could be a breather? Any help would be much appreciated, thanks in advance.