EML - airleak?

Ok had eml on in November, replaced o2 sensor, sorted. Mechanic mentioned some of the breathers coming off rocker not being great. I got a few and had them ready for him to do when it was due a service in March. Eml came back on saying airleak which he put down to the breathers he was going to replace. They were changed but eml back after a week saying about an airleak. It’s not a proper fault code, when light turned off it’s taking a few days to come back on. He’s going to have a better look this week but has anyone else experienced similar?

cheers in advance 👍