What's your question? Ask

This is most likely just the natural aging of the plant stems.
If the plant is healthy and growing, I would not worry about it.

Here is a link to refresh you on the care requirements.

https://www.gardeningknowhow.com/houseplants/peace-lily/peace-lily-plants.htm

To make things easy, what you can do is mix equal parts orchid potting medium and regular potting soil. These two types of potting mediums, which are readily available at most garden centers and hardware stores, will have all of the ingredients needed for good potting soil for peach lilies.

A layer of rocks at the bottom of the pot can help with drainage but they are not necessary, especially if you use the potting medium described above.

A good quality, all purpose potting mix is recommended for most houseplants.
Here is an article that will help you.

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/types-of-potting-soil.htm

The Peace Lily flowers start out green then turn white, and then as they age turn green again. Eventually the flower turns brown before it collapses.
These changes are all due to chlorophyll.
You can remove the flowers when they turn green, if you prefer your plant to have it's white flower appearance.

https://www.gardeningknowhow.com/houseplants/peace-lily/peace-lily-plants.htm

Flush the soil out using distilled water and place the plant in indirect light. If the sun damage was not too severe, it should perk in a few days.

Medium to low light conditions.

https://www.gardeningknowhow.com/houseplants/peace-lily/peace-lily-plants.htm