The short answer is "Let me know" what is not working (and what page it's on) and I'll do my best to sort it out.
Sometimes the people who run websites change things (or even totally get rid of a page) and, as they don't know who is linking to them, or in the case of an internal link I forget what other pages link to the one I move, the alteration means the link doesn't work any more.
This happened with Icom in the manuals section. As soon as I knew about it, thanks to Ian, MW0SGT, who emailed me about the failure, the new link was tracked down and the link data was updated.
As there are so many pages and links throughout the site it is not practicable for me to check everything on a weekly basis so users who come across faults are more than welcome to tell me (I'll own up if it was my fault. Honest!).