The "red-sticky fluid" you cleaned off was probably fuel residue from the EHA having a small leak. This is a common problem.
The EHA controls your mixture-fuel pressure, for warm up/full throttle enrichment/ decelleration/ etc. It can be replaced by just unplugging the elec plug & the two screws that hold it to the fuel distributor.
Two things to make sure of:
1-bleed the fuel pressure before loosening the unit- or you risk getting sprayed with fuel. (I recommend-putting a shop towel on top of the unit so it will "catch" any sprayed fuel when you first break the screws loose.
2: make sure to use the new o-rings that come with the new EHA