Please Help: Loose part in Minolta SRT-202

Hello, all! I'm hoping you might be able to help me to diagnose what's going on with my Minolta SRT-202. I recently noticed a rectangular-ish object that seems to be floating freely on top of the focusing screen--it is visible both through the bottom of the focusing screen (at least, I think it's the focusing screen) when the lens is removed and as a silhouette through the camera viewfinder. It moves around when I change the position of the camera, consistent with gravity (reversed in the viewfinder). The problem first appeared after I turned the camera upside down (gently) to replace the battery, so I suspect something came loose. (I have no idea if it's relevant--I'm pretty new to film photography--but in certain conditions, I can also see a faint outline of the pentaprism if I look downward into the viewfinder; I'm not sure if I could do this before the mysterious object appeared.)

Does anyone have any idea what might be going on? Is it likely to affect the camera's performance, short-term and/or long-term? (I'm currently waiting on a roll of film to be developed that I finished after spotting the problem, so it's possible that the roll will answer that question)? I am not entirely averse to opening up the camera and trying to fix it myself (based on online guides to opening the camera, not on any prior experience) if it is a minor problem, but I don't want to open it up if I'm just going to have to send it for repairs anyway (and I don't want to send it away for repairs if there's no hope!).

I've attached a rather bad image of the problem (setting up for a proper macro shot is difficult at this moment in my life, but I can try to get a better photo if truly helpful). This is looking up through the focusing screen (or maybe it's the focusing screen reflected in the mirror; I don't remember).

Thank you for any assistance you may be able to offer!

It is probably just a shim come loose and is floating around.

Unless it is striking your meter needle, there should be no problems other than being irritating.

EDIT: Look through the viewfinder and see if you can see the F-Stop numbers in the window above the viewfinder. It might be part of the mirror system used to reflect these f numbers to your VF. Same thing; irritating but not a deal breaker.

The reflex viewing system is not in the optical path to the film, so it won't be superimposed on the image.

The SRT-202 is a great camera and well worth sending out to get a CLA (clean, lube and adjustment), as well as fix the VF problem.

It should shoot reliably for 20 to 30 years after being refurbished.

Oh, you got it with your edit, I think--I hadn't even noticed that the F-stop numbers had disappeared, but sure enough, they're nowhere to be found.

Happy to send it out for some loving care, since it sounds unlikely to result in a shipping bill with nothing to show for it, which was my main concern. I love the camera, so I'm happy to hear this (and happy that it sounds like I can keep using it, just with a bit of annoyance, until it's a little bit more financially convenient to send it out).

Thank you so much!