The monthly chart is showing price is attempting to retest old trendline support as resistance. 2008 when price broke below TL support 2003 thru 2008 price tested it as resistance will price try to retest it as resistance.
I do not know if the SPX will trade up to its old channel with summer starting in a few weeks, but if it does, I would look for...
The SPX is in a confluence zone where price seems to have trouble getting over. Price has run into its monthly channel that started in 1982. The last time price kissed its upper channel in 2000 price was rejected and it seems like price is being rejected again. Using the highs of 1987 as an anchor price is trading in another gann sq similar to 2000 and 2007 highs....