I have never had a varicap go dodgy, but, easy to put a trimmer cap in place of it to see if it is dodgy, just lift one leg of the varicap off and solder a 22pF trimmer or similar to see if it starts working.
I don't trust any of those ceramic de-coupling caps in Grundig's had problems before with them.
I have also had solder flow problems, which normally look like a circular crack around the component legs. If in doubt, reflow the lot- it is quick and easy.
