I recently moved abroad and left my 4 year old dracena at my Mum’s house. I had always kept it in a south facing window with blinds so thought it would be okay in the south facing window at this house but I do admit it gets hot in the room when the sun is out. My mum says shes watered him thoroughly every 10 days (she takes him out onto the balcony and drenches him completely and lets him drain before bringing him back in again) which is the same level of watering as I normally did before I moved (I like to really make sure the soil is dry through before drenching him properly). But maybe during the heatwave 10 days wasn’t enough? Or maybe it was the sun, I’m not sure.

I don’t know if I should cut off the yellow crispy leaves or just leave them? I am nervous if I do that he’ll look really bare as there’s so many affected leaves… Hes so big now that I am reluctant to cut and let him regrow from there, but maybe I’m being overly sentimental (hes the oldest plant I own and a gift from my brother!)   
I’m home for a couple of weeks so have time to repot and sort him out but I need help with what to do now and then instructions to give my mum for when I leave again 

Thanks very much gardeners reddit :) 

Advice needed, is this sun damage?