Cannot completely convert PDF from CMYK to RGB

I have a 48-page CMYK pdf that was produced by Quark. All placed images are CMYK.
Using Acrobat X, I select Tools -> Convert Colors -> Convert Colors to Output Intent sRGB IEC61966-2.1, I am able to convert 99.99% of the document to RGB. However, a tiny portion of the document (a total of only 32 pixels) stubbornly remains CMYK. I cannot get a completely RGB PDF, and it's causing problems with our production process.
The parts that remain CMYK are miniscule. For example, there's an apostrophe on page 34, the top half of a comma on page 8. Examination of the uncompressed PDF reveals 3 tiny CMYK objects. Here's a typical object that is only 3x6 pixels.
5606 0 obj
<<
/ColorSpace /DeviceCMYK
/Subtype /Image
/Length 6
/Width 3
/Type /XObject
/BitsPerComponent 1
/Height 3
>>
stream
^Q^P^Q^P^Q^P
endstream
endobj
Also, at one point in the document is a reference to a /Separation of DeviceCMYK, which I don't understand (I assume this is item (1) in the report below:
3307 0 obj [/Separation /All /DeviceCMYK 4249 0 R]
endobj
When I produce a preflight inventory, it reveals four references to CMYK:
(1) Color Space 316 (out of 316)
on page 45
Color Space properties:
Separation color space: "Registration color" CMYK (1.0/1.0/1.0/1.0)
Color name: All
Alternate color space
DeviceCMYK color space
(2) Image 935 (out of 2432)
on page 48
Image properties:
Page 48: CMYK
Width/Height (pixel): 3/3
Bits per color component: 1
Treated as a mask: False
Perform interpolation: False
Compression/encoding
ZIP/Flate compression (FlateDecode)
DeviceCMYK color space
(3) Image 2233 (out of 2432)
on page 34
Image properties:
Page 34: CMYK
Width/Height (pixel): 2/5
Bits per color component: 1
Treated as a mask: False
Perform interpolation: False
Compression/encoding
ZIP/Flate compression (FlateDecode)
DeviceCMYK color space
(4) Image 2302 (out of 2432)
on page 8
Image properties:
Page 8: CMYK
Width/Height (pixel): 2/7
Bits per color component: 1
Treated as a mask: False
Perform interpolation: False
Compression/encoding
ZIP/Flate compression (FlateDecode)
Why can I not complete the CMYK->RGB conversion? And why do only 32 pixels out of millions in the document refuse to convert?
Is there a way to force the document colorspace and all colors to become RGB beyond what I've already done?

That might be it, Jacob.
It's when, for instance, I have the Appearance window open and shift-click on the stroke or fill to see the color attibutes (rather than simply looking at the swatches). It kept showing up in CMYK.
But making that change in the flyout seems to have it showing properly.
Thanks!

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