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What kind of a genome is it, and what kind of assembler have you used? Normally, PacBio-only assembly should not contain many errors, since assemblers polish the assembly before it's finalized.
At any rate, you can polish the assembly using Racon (https://github.com/isovic/racon), or a built-in polisher from flye assembler (https://github.com/fenderglass/Flye).
yes, both work fine with long reads only.
Why are you so sure these are in fact errors? Did you look at the alignments in a genome browser, e.g. IGV? Visual inspection can often be misleading - you need a pileup and some sort of summary (BAM + BAI index in IGV help with this nicely - you'll see variants in coverage right away).
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You can use Quiver (if you have old RS reads) or Arrow (Sequel reads) to polish your assembly. You can also give Pilon a try. The newest version supports long reads.