The following changes to address handling of monochrome are identified (this ticket includes only changes not relating to the syntax tables):

Section 8.4.1:

After "Depending on pcm_flag[ xC ][ yC ], the decoding process for chroma samples is specified as follows:"
Add the following line:
"- If ChromaArrayType is equal to 0, no chroma samples are decoded and this process is finished."

Section 8.5.3.2.2:

"For each chroma sample location..."
replace with:
"When ChromaArrayType is not equal to 0, for each chroma sample location..."

Section 8.5.4:

"2. The decoding process for chroma residual blocks..."
replace with:
"2. When ChromaArrayType is not equal to 0, the decoding process for chroma residual blocks..."

"3. The decoding process for chroma residual blocks..."
replace with:
"3. When ChromaArrayType is not equal to 0, the decoding process for chroma residual blocks..."

Section 8.7.2.4.1:

"The filtering process for edges in the chroma coding blocks of current coding unit consists..."
replace with:
"If ChromaArrayType is equal to 0, this process is finished, otherwise (ChromaArrayType is not equal to 0), the filtering process for edges in the chroma coding blocks of the current coding unit consists..."

Section 8.7.2.4.2:

"The filtering process for edges in the chroma coding blocks of current coding unit consists..."
replace with:
"If ChromaArrayType is equal to 0, this process is finished, otherwise (ChromaArrayType is not equal to 0), the filtering process for edges in the chroma coding blocks of the current coding unit consists..."

Section 8.7.3:

"When slice_sao_chroma_flag of the current slice is equal to 1, the coding tree block modification process as specified in subclause 8.7.3.1 is invoked with recPicture set equal to recPictureCb, cIdx set equal to 1, ( rx, ry )..."
replace with:
"When slice_sao_chroma_flag of the current slice is equal to 1 and ChromaArrayType is not equal to 0, the coding tree block modification process as specified in subclause 8.7.3.1 is invoked with recPicture set equal to recPictureCb, cIdx set equal to 1, ( rx, ry )..."

"When slice_sao_chroma_flag of the current slice is equal to 1, the coding tree block modification process as specified in subclause 8.7.3.1 is invoked with recPicture set equal to recPictureCb, cIdx set equal to 2, ( rx, ry )..."
replace with:
"When slice_sao_chroma_flag of the current slice is equal to 1 and ChromaArrayType is not equal to 0, the coding tree block modification process as specified in subclause 8.7.3.1 is invoked with recPicture set equal to recPictureCb, cIdx set equal to 2, ( rx, ry )..."