On the other hand...
If you adjusted a regulation screw and made the problem worse, try screwing it the other way a little at`a time (half a turn, maybe) and see if that at least takes you back to how it`was before you adjusted it.
Even without a leak light it is possible to tweak the regulation
provided that you are cautious, careful and logical. But - you may have a leak light in your home without knowing it... cheap LED Christmas lights (ideally white) can be fed into the bell and by tilting the sax you can get`a few of the string far enough up the bore. Then in a darkened room put a rag over the bell, close all the toneholes and see if it shows you a leak (or two... or three...). Easier if you`have an assistant, but`you can do it alone.
Find your leak, then decide what to do next... it could be a tiny bit of cork has gone AWOL, rather than a screw going out of adjustment or something getting bent. Temporary repairs are possible - a tiny bit of card held in with a sliver of selotape can get you out of a hole on a gig or a lesson. I always have some in my case, along with selotape and a little screwdriver. If you are going to tweak a regulation screw, do a little at`a time and see if it improves. DON'T do several different things at once, or you won't know what is doing which...
As jbtsax says, you must avoid pressing the keys harder if your sax starts to develop leaks. It is well worth developing an ability to spot problems early and trying to figure out what is causing it. Understanding how your horn works - and how it can go out of kilter - is part of the skill of being a musician, as is being able to do at least some repairs and adjustments yourself. If the clock is ticking before a gig starts you need to have some tricks up your sleeve...
Have a look at this site. Lots of information to help with your problem, but also stacks and stacks of other stuff of great interest (including some humourous articles!). I bought the book and wouldn't be without it!
http://www.shwoodwind.co.uk/HandyHints/HandyHints.htm