Looking for a reasoanble solution. How to fix a leak?

There is 2 storey rear extention's roof. Water drips from the ceiling during very bad rains. In August had ridges repointed, never had had any problems before. Water ingress is coming from the top tiles (uncovered pinholes below the ridge tiles found). Fresh pointing between the ridge tile has cracked and partly falling out. Which lets water coming through into the house as well. I've been told about 3 options. 1. Put a layer of halftiles below the ridges and rebed all ridges. 2. Move tiles course up a bit to cover pinholes under the ridges and rebed them. 3. Cover pinholes with mortar 3-1 sand-cement and repoint ridges. What do you think is the most reasonable option? My concern is that the roof is quite old and heavy (concrete tiles) and as long as it does the job does it make sense adding more tiles or move tiles which've been in this position for years and years and years. I am told that mortar would last up to 10 years. Thanks a lot.