Sunroof leak

Has anyone else experienced this?

i just bough a 1.4i S reg LX for £1350 and have found that the sunroof is actualy leaking at first i thought maybe i didnt shut it properly but it happened again today

how much does this cost to repair? can i do it myself?

sunroofs on 306's aren't a seal they work via drainage if you open sunroof fully and look in the front left and right corners there will be a small hole this is probably blocked just needs cleaning out with something
hope this helps