Mercury optimax dfi 135 hp oil reservoir problems

The small oil reservoir inside the cowling wasn&getting oil thus, 4 beeps at the start of the engine and repeats every 2 minutes to let you know that the engine will go on safe mode (Rev limit). In my case, one of the hoses was clogged and both caps were dirty. caps must be clean to seal air and oil. The solution was to apply air in the oil hose and clean the caps.