Get yourself a used laptop or PC that is capable of running the AP Manager program. Or find a friend that will let you install the program on their computer. It doesn't take cutting edge hardware to run it. Then take some logs and have a look at them or post them up. You're talking about the health of your engine here. The only way to know if things are safe is to look at your logs.
It's like saying you think you might be having a heart attack but you can't call 911 because your cell phone is broken.