Beginner Gardening: Scheflera pest?, 0 by Doc0Rx

Doc0Rx wrote:
My 15 year old scheflera has been doing well for all these years and now these weird beige to greyish spots are showing up on its' leaves. I've attached a picture. It started on the lower leaves and is spreading upwards. The leaves eventually fall off. Some turn totally yellow before falling and some stay green (but still have those spots on them).The only change I noted is that the room that it lives has been on the warm side (82 degrees Farenheight) due to the recent heat wave. Any ideas? Could it be a bug pest? Thanks in advance for your help?