My long-awaited trip through the rainforest - BR-319 from Humaita to Manaus, 2013 Septembre. It took 6 days, but we drove very slowly.
Report day by day:
Tarmo RTW: Humaita-Manaus, BR-319, Day 1
Tarmo RTW: Humaita-Manaus, BR-319, Day 2
Tarmo RTW: Humaita-Manaus, BR-319, Day 3
Tarmo RTW: Bridges, BR-319, Day 4
Tarmo RTW: Humaita-Manaus, BR-319, Day 5
Tarmo RTW: Humaita-Manaus, BR-319, Day 6, Manaus
And some photos:

Muddy part
Link:
Road BR-319 Humaita - Manaus by Mazda E2200 - YouTube
How to cross muddy part... just go!

Local transport from Manaus to Labrea, every week.
And here are GPS coordinates of towers, started from Humaita. First six are serviced from Humaita side, and others from Manaus.
Muddy part is between 6 and 7th tower. The gates are locked, but there are very big holes, so no problem to go closer.
Embratel 1 S07 12.420 W063 08.192
Embratel 2 S06 54.443 W063.04.423
Embratel 3 S06.36.732 W062.57.340
Embratel 4 S06.22.116 W063.48.341
Embratel 5 S06.07.281 W062.35.366
Embratel 6 S05.53.279 W062.23.897
Embratel 7 S05.39.247 W062.13.520
Embratel 8 S05.21.415 W062.02.273
Embratel 9 S05.08.955 W061.45.665
Embratel 10 S04.55.432 W061.30.059
Embratel 11 S04.37.940 W061.15.071
Embratel 12 S04.22.447 W060.57.196
Embratel 13 S04.05.014 W060.41.062
Embratel 14 coordinates missing (inside Careiro city)
Embratel 15 S03.30.801 W060.08.123
Embratel 16 S03.12.450 W059.52.228
Q. Do you want to do it again??
A. Certainly!