876-880 is a huge level of resistance now that I will be watching the remainder of the week. I think Tuesday gives us some more possible downside if we cannot break higher above this level. To the downside it is probable we can see 850 and below that watch for 838-840 for support.
During this week anything can happen with such low volume but the bias appears to be set for a bit more of a pullback if we cannot get over the 880s and close there.
Odds are that this week will be a slow grind out sort of market week, with plenty of choppiness. So take gains when you get them as I can already tell this market is a bit more erratic than usual.