is it just newer, or just older leaves ?

also, is it colder than usual ? the temp can effect PH, which can effect uptake of some minerals... My guava leaves turn red and purple when its cold and the soil is wet. it changes the PH limiting a mineral ( i think phosphorus ?)

i give mine iron chelate and epsom salt 3-4 times a year. (foliar spray and drench)

either way, i would let it dry out a bit first, and keep an eye on the new growth leaf color.

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Signs of Nutrient Deficiency

Calcium: New leaves misshapen or stunted. Existing leaves remain green

Nitrogen: Upper leaves light green, lower leaves yellow. Bottom (older leaves) yellow and shrivelled.

Carbon Dioxide: White deposit. Stunted growth. Plants die back

Phospate: Leaves darker than normal. Loss of leaves.

Iron: Young leaves are yellow/white with green veins. Mature leaves are normal.

Potassium: Yellowing at tips and edges, especially in young leaves. Dead or yellow patches or spots develop on leaves.

Manganese: Yellow spots and/or elongated holes between veins.

Magnesium: Lower leaves turn yellow from tip inward. Veins remain green.

It's old leaves not new. That happened within a day. When i removed the pot outside and the soil got from wet to wetter. Thanks for this