Return to US -h1 and GC doubt - HELP

[software]

I left US couple of years back becoz dad passed way, valid stamping is there for another 4 months.
1) I am planning to return to US on h1b (same employer) - will there be any issue at port of entry. Is client letter mandatory or vendor letter sufficient.
2) I have an amendment done a month back from India, but no I-94 attached. should i go for another stamping?
3) My GC filing dates came through- but due to sudden departure, i couldn't take care of 20k credit which went to write off. will there be a credit history check?

Pls provide your input.

[Tyler_durden]

Am in a similar situation.