From the following chart on the market indices, it already shows some sign the market is ready to pull back. The last time the DJIA made a new high, it did not receive the Dow Theory confirmation from the DJT. Furthermore, continue deterioration from the advance/decline and the new-high/new-low re-affirms internal market weakness is developing. In the video, a look at some of the stocks along with CSCO that could drag the market down.
Indices:

SP500 & DJIA:

Nasdaq:

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Disclosure: Long AAPL & NFLX