ive seen a few starlets leak from here its not uncommon if the timing belt has been done recentley thats not a problem get a good mechanic to whip the covers off and the belt off and the lower timing cog replace the seal refit the belt have a look at the water pump while your in that deep if been replaced if all good then refit belt as its fairly fresh fit all back together job done ,, usually take about and hour two hours to get it done