Titan has been busy lately but won't go into details (Titan - if you are reading this apologies for spilling the beans).
And I've also been busy at work so can't spend too much time here now. Don't worry - I'll still try my best to do a bit of urbex or scouting at the least.
If I get time, I'll try and follow up with Titan. I'm sure it's not just a "permissions" problem to a single php file. 403 errors in themselves can mean lots of things including changed library/file locations etc...
I'm sure if it were that easy Titan would have fixed this ages ago.
Just a harmless explorer. No need to waste taxes checking me