The exterior is clean.
The “OVER” indicator in the viewfinder is always lit very slightly.
This is not a concern when shooting outdoors, but the light is visible in the dark indoors.
It is not enough to consume the battery.
(See photo in viewfinder.)
It lights up brightly when overexposed, so it is not a functional problem.
Top cover removed, eyepiece and prism cleaned.
Clean the electronics board and electrical contacts.
Focusing screen and mirror also cleaned.
See photos.
Very clear with very little dust in the viewfinder.
Auto, manual, B mode, and self-timer work fine.
In auto, the shutter speed indicator in the viewfinder changes according to brightness.
Removed bottom cover and lubricated each gear.
Clean battery contacts.
Replaced the moltplane in the film chamber.
Lens cleaned inside and out.
No dust, mold, or haze.
Focus helicoid, aperture ring, and zoom ring rotate smoothly.
Both body and lens can be used normally without any problems.